Lancelets Are small marine animals. They spend most of their time buried in the sand with their mouth sticking out to filter food from the ocean water. These animals have a body feature called a nerve cord along the back as well as a notochord Guild muscle blocks and a tail. However, they do not have a 
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These animals have a body feature called a nerve cord along the back as well as a notochord Guild muscle blocks and a tail. However, they do not have a chordates.
The lancelets (often known as amphioxus and placed in a group known as cephalochordates, of which the best known are in the genus Branchiostoma) are small marine chordates that are most closely related to the vertebrates.
The dorsal nerve cord and chordates has pairs of nerves that connect to the organism's muscles. In some organisms, the dorsal nerve cord expands into a brain at the top.
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Related Questions
What all happens on Prophase 1 of Meiosis 1
There are 3 ways that meiosis and sexual reproduction lead to genetic variation. Explain those 3 ways
Crossing over
Independent assortment of homologous chromosomes
Random fertilization
Answers
rophase 1 is the first stage of meiosis 1, during which the following events occur:
Chromosomes condense and become visible as paired homologous chromosomes. Each chromosome consists of two sister chromatids held together by a centromere.
Non-sister chromatids of homologous chromosomes pair up and form a tetrad or bivalent.
Crossing-over occurs between non-sister chromatids of homologous chromosomes, resulting in exchange of genetic material between the homologous chromosomes.
The nuclear envelope breaks down, and spindle fibers attach to the kinetochores of the homologous chromosomes.
The three ways that meiosis and sexual reproduction lead to genetic variation are:
Crossing over: During meiosis 1, homologous chromosomes pair up and exchange segments of genetic material by crossing over. This creates new combinations of alleles on the chromosomes, leading to genetic variation in the resulting gametes.
Independent assortment of homologous chromosomes: During meiosis 1, homologous chromosomes align randomly on the metaphase plate, resulting in random segregation of maternal and paternal chromosomes into the daughter cells. This leads to a variety of possible combinations of chromosomes in the gametes.
Random fertilization: During sexual reproduction, any sperm can fertilize any egg. This leads to a random combination of alleles from the two parents, resulting in genetic variation in the offspring.
Answer:
Crossing over: As mentioned above, crossing over during prophase 1 creates new combinations of alleles on the chromatids. This means that each gamete will have a unique set of genetic information.
Independent assortment of homologous chromosomes: During metaphase 1, the bivalents line up randomly along the metaphase plate. This means that each gamete will receive a random assortment of maternal and paternal chromosomes. There are 2^n possible combinations, where n is the number of chromosome pairs (23 in humans).
Random fertilization: During sexual reproduction, any gamete from one parent can fuse with any gamete from another parent. This adds another layer of randomness to the genetic makeup of the offspring. There are 2^n x 2^n possible combinations, where n is the number of chromosome pairs (23 in humans).
Explanation:
Why should we consider using a variety of energy sources to meet our energy needs?
Diversifying the types of renewable energy used will allow systems to better meet the needs of local communities.
Each energy source provides a different kind of energy – some generate electricity while others provided liquid fuels for vehicles.
There is disagreement over which single source to go with because different factions back different energy sources.
Starting with windmills then switching to solar and geothermal if windmills are not cost effective will save money in the long term.
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By using a variety of energy sources to meet our energy needs as each energy source provides a different kind of energy – some generate electricity while others provided liquid fuels for vehicles.
The amount of food energy required to maintain body size, body composition, and a level of necessary and desired physical activity consistent with long-term good health is known as energy needs.
Calculating energy needs can be done in a variety of ways. Take the athlete's weight in pounds and multiply it by ten to get a rough average of their basal needs, or needs without exercise.
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Many scientific discoveries have contributed to the explanation of how life began on Earth. Which of the following was NOT used to develop this scientific theory?
Oparin's "primordial soup" theory was tested by Miller and Urey by passing sparks through a mixture of gases to represent lightning and within a week, several simple organic molecules had formed.
Louis Pasteur disproved spontaneous generation by showing that bacteria will not grow on meat in a sterilized environment.
Scientists supported Lynn Margulis' theory that eukaryotic organelles such as mitochondria and chloroplasts originated as prokaryotes that lived inside other, larger prokaryotic cells.
Darwin's argument that vestigial structures are evidence that evolution has occurred.
Answers
Darwin's argument that vestigial structures are evidence that evolution has occurred was not used to develop the scientific theory of how life began on Earth. The other three options are all relevant to the development of this theory. Oparin's theory proposed that the first living organisms arose from a mixture of organic compounds in the Earth's early oceans, and Miller and Urey's experiment supported this idea by demonstrating that these compounds could be formed through natural processes. Pasteur's experiments demonstrated that life does not arise spontaneously, which helped to reject the idea of spontaneous generation and support the theory of biogenesis. Margulis proposed the endosymbiotic theory, which explains the origin of eukaryotic cells and their organelles, and this theory is supported by scientific evidence.
What needs to occur for a male to be color blind?
Responses
He needs to inherit a recessive allele that causes color blindness from both his parents.
He needs to inherit a recessive allele that causes color blindness from either his mother or father.
He needs to inherit a recessive allele that causes color blindness from his father.
He needs to inherit a recessive allele that causes color blindness from his mother.
Answers
Answer:
Explanation:The sole X chromosome that males inherit from their mother is. They will suffer red-green color blindness if that X chromosome carries the red-green color blindness gene rather than a normal X chromosome. Two X chromosomes, one from the mother and one from the father, are present in females.
All of the following are dam effects to land upstream EXCEPT O Increased temperature Rapid water flow O land becomes flooded O Increase sediments
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Dam affects land upstream expect land becomes flooded. Dams are constructed over the river's function. The dams help in the generation of electricity which is known as hydrothermal energy. They help in trapping the sediments, and rock bed on the riverside the place where fish spawn.
The feature of the habitat which affects the rivers are trapped such as logs, gravel, and other food option. There are negative effects of the building of dams are displacement of the people as the area gets flooded and maintenance and creation cost are high and complex.
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Which of these is an advantage of solar power?
It is versatile. There are many different ways to trap heat or produce electricity from solar energy.
It is the most inexpensive way to generate electricity on a large scale.
The price has dropped dramatically in recent years and it is now very affordable for the average homeowner.
It is a form of energy that can be trapped 24 hours a day, year round.
Answers
The advantage of solar power is it is the most inexpensive way to generate electricity on a large scale.
The sun's energy is converted into electricity by solar power. Electricity and heat are the two forms of sun-generated energy that we can use. Both are created using sun powered chargers, which range in size from private roofs to 'sun based homesteads.
Solar power heating, passive solar design for space heating and cooling, and solar photovoltaics for electricity generation are the most widely used solar technologies for homes and businesses.
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Pls Help I need help, I need a drawing of model
Throughout human existence we have relied on the oceans – for food, as a waste dump, for recreation, for economic opportunities and so on. However, it’s not only our activities in the marine environment that affect life in the sea – it’s also the things we do on land.
It is hardly unexpected that our actions are having an impact, given that more than half of the world's population currently resides within 100 kilometers of the coast. With our quick population growth, major technological advancements, and huge changes in land usage, human impacts have risen. New Zealand is not an exception when it comes to the effects of overfishing, pollution, and alien species on marine life.
The ocean and the creatures that dwell there are coming under growing pressure from human activity, both at sea and on land.
The ocean has probably always provided sustenance for people who live near the coast. However, many fish stocks all around the world have decreased dramatically as a result of improvements in fishing gear, bigger ships, and new tracking technologies. Many people now believe that the fish populations on the continental shelf have been over- or totally fished. Unsustainable fishing methods can harm the marine environment in other ways besides diminishing fish stocks. For instance, certain fishing methods like trawling and dredging can significantly harm marine habitats and creatures that live on the sea floor. Additionally, bycatch, or non-target species, are frequently caught using these approaches and discarded.
Answers
Unsustainable fishing practices refer to the use of different fishing techniques to catch or harvest fish at a rate that causes fish populations to decline over time.
Thus, In addition to being used as a technique for overfishing, which causes fish populations to decline at a rate that cannot be sustained, these tactics are seen to enable the destructive fishing practices that devastate ocean ecosystems.
These unsustainable fishing techniques can be carried out using anything from consumer-level gear like fishing rods and nets to commercial-grade machinery like bottom trawling.
These fishing techniques are not sustainable since they are used in conjunction with rising fishing demands brought on by social behaviors like over-exploitation and over-fishing.
Thus, Unsustainable fishing practices refer to the use of different fishing techniques to catch or harvest fish at a rate that causes fish populations to decline over time.
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What is the definition of a scientific theory?
A.
The final outcome of an experiment completed one time.
B.
A proposed explanation for an occurrence based on available data, observations, or evidence.
C.
A well supported explanation of why a phenomenon occurs.
D.
A scientifically acknowledged principle that has been confirmed by repeated experimental observations.
Answers
Answer:
D
Explanation:
A scientifically acknowledge principle that has been confirmed by repeated experiment observations.
What water molecule forms with hydrogen
Answers
Cohesion: Hydrogen Bonds Make Water Sticky
In the case of water, hydrogen bonds form between neighboring hydrogen and oxygen atoms of adjacent water molecules. The attraction between individual water molecules creates a bond known as a hydrogen bond.
answer: adjacent water molecules
By 2050, the single major source of electricity is projected to be
natural gas.
nuclear.
wind power.
solar power.
Answers
Answer:
solar power.
Explanation:
Solar power is projected to be the single major source of electricity by 2050 due to a combination of factors. First, solar technology is rapidly improving, becoming more efficient and affordable. This has made solar power increasingly competitive with traditional fossil fuels, even in regions with less sun exposure.
Can someone help?!?! QUICK!! THANK YOU!
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The type of selection that is demonstrated on the graph is C. stabilizing selection.
What is stabilizing selection ?Stabilizing selection, a natural form of selection, prioritizes the advantages associated with the survival and reproduction of individuals bearing average or intermediate characteristics within a collective. Conversely, it functions to the detriment of those carrying anomalous or extremely distinctive traits.
Such individuals face detrimental consequences because their exceptional physical attributes could lead to an absence in skillsets essential for adapting to varying environmental conditions, rendering them ineffectual competitors for resources as well.
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Question 7 of 10
Which of the following is a way group behavior can help a human community
survive?
O A. Constructing housing
OB. Consuming more products
OC. Growing individual gardens
OD. Polluting the water supply
SUBMIT
Answers
Constructing housing. The correct option is A
What is Constructing housing ?Building and constructing residences or other sorts of structures meant for human habitation is referred to as housing constructing. Depending on the geography and the resources available, several materials and techniques might be used for building homes.
Building homes can fulfill a basic human survival requirement for shelter and protection from the elements. Group dynamics can also facilitate the sharing of information and assets needed for house construction, such as building methods and materials.
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pls help asap! due tonight! 9th grade bio
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Regulatory proteins are molecules that form a complex connection with certain segments of the DNA, resultantly managing gene expression.
How to explain the termsAn operon is a collection of transcribed genes governed together and viewed jointly. It encompasses an operator, a promotor, and the transcribed genetics.
The promotor is an assembled series of DNA located upstream to the gene nucleotide outlines and acts as the facultative hub for the RNA Polymerase enzyme which initiates the transcription process. The operator is another sequence of DNA found upstream of the promotor and acts as a toggle switch allowing either activation or deactivation of the gene.
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Red Bone Marrow is
A. formed by tissue cells
B. capable of producing blood cells.
C. found only in children
D. a source of pathogens
E. found in the center of all adult bones
Answers
Answer: B. capable of producing blood cells.
Explanation: Red bone marrow is the anatomical structure that safeguards hematopoietic stem cells, which are crucial progenitors of a diverse array of blood cells comprising erythrocytes, leukocytes, and thrombocytes. Spongy bone tissue is discernible within relatively large bones, such as the pelvis, sternum, and skull, in both adult and pediatric populations. Red bone marrow is known to be abundant in the skeletal system of children; notwithstanding, it remains present in the bones of adults, albeit with a tendency to be displaced by yellow bone marrow as we progress in age.
What does the moon not have on its own?
O rotational period
O gravity
O revolution period
Olight
Answers
The Moon can only be seen as a result of the Sun's light reflecting off it. It does not produce any light of its own.
The moon does not produce any light on its own, and can be seen of reflection from sun light
Which of the following statements is NOT true? A. Cutting down trees affects the water cycle.
B. Ocean levels rise in an ice age.
C. Oceans hold most of the world's water. D. Clouds are formed because of cold temperatures.
Answers
Answer:
B. Ocean levels rise in an ice age.
Explanation:
During cold-climate intervals, known as glacial epochs or ice ages, sea level falls because of a shift in the global hydrologic cycle; water is evaporated from the oceans and stored on the continents as large ice sheets and expanded ice caps, ice fields, and mountain glaciers.
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Based on the understanding of the process of photosynthesis what are the strengths and weaknesses of this model
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Answer:
The strength of the photosynthesis model is that it shows the complicated process that happens in different parts of the plant. However, a weakness of the model is that it oversimplifies the process and does not account for all of the factors that can affect photosynthesis, such as environmental conditions or plant genetics.
what society can do for bullied people like khalil
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a muscle contracting and pulling the hand away is shown by
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The essential muscles that get worked during a Draw Up are the latissimus dorsi, trapezius, deltoids, rhomboids and pectoralis major; However, this exercise also involves many other smaller muscle groups.
When the thin actin and thick myosin filaments pass each other, muscle contraction occurs. Cross-bridges that extend from the myosin filaments and cyclically interact with the actin filaments during the hydrolysis of ATP.
Smooth muscles is a muscle that does most of the body's automatic work involuntarily. found in the walls of the majority of the body's tubular structures, such as blood vessels and the Gastrointestinal track.
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Identify and label the following stages of meiosis:
What are the two phases of Meiosis and their sub-phases
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In sexually reproducing organisms, meiosis is a kind of cell division that results in the production of gametes, or sex cells. Meiosis I and Meiosis II make up the two phases of the process. The reduction division is another name for meiosis I, which is the first stage of meiosis.
Each chromosome is replicated and the number of chromosomes is halved during this phase. Following replication, the chromosomes couple off and cross over to exchange genetic material. Four daughter cells are created as a result of this process, each of which has half as many chromosomes as the parent cell.
The equational division is another name for meiosis II, the second stage of meiosis. The replicated chromosomes separate during this phase, and the cell divides.
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Which of the following recommendations can help prevent sharps injuries? (Select 2 correct answers):
a. Wear an N95 mask whenever using sharps
b. Minimise sharps handling and avoid passing sharps by hand
c. Dispose of the sharps containers before they are half full
d. Dispose of sharps into an approved yellow clinical waste bag
e. Do not recap sharps of. Dispose of sharps into an approved plastic sharps container, which is usually green in colour.
Answers
The recommendations can help prevent sharps injuries are
b. Minimise sharps handling and avoid passing sharps by hande. Do not recap sharps of. Dispose of sharps into an approved plastic sharps container, which is usually green in colour. Why the two options are to prevent sharps injuriesThese two vital answers, b and e, highlight the necessity of lessening the manipulation of sharps, as well as guaranteeing their suitable disposal into accepted sharps holders, which are fundamental principles in hindering sharps injuries in medicinal precincts and other environments.
It is essential to obey validated directions, policies, and approved conventions for sharps protection to protect healthcare personnel and individuals from the possible menace caused by sharps traumas.
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Directions: In the space below, draw and label the Trichoplax adhaerens using the directions in the slideshow that appears on the page where your accessed this worksheet. Your labeling should include the dorsal surface, cover cells, the ventral surface, cylinder cells, gland cells, fiber cells, and cilia.
Answers
Trichoplax adhaerens is a small, flattened, and ciliated animal belonging to Placozoa phylum. Its body is a few millimeters in size and has a simple, two-layered structure, with an outer layer of cover cells and an inner layer of cylinder cells.
Thus, the different structures of Trichoplax adhaerens include dorsal surface which is the upper surface facing upward. Then, cover cells are present which is the outermost layer of cells that cover the animal body.
Ventral surface in Trichoplax adhaerens is the lower surface of the animal facing downward. Cylinder cells are the inner layer of cells lining the digestive cavity of the animal.
Gland cells are the cells that secrete enzymes for digestion in Trichoplax adhaerens. Fiber cells help to maintain the shape of the animal and cilia are hair-like structures covering the surface of the animal.
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B
4000
Exam Lesson Name: Plant and Animal Systems, and Behavior
Exam number: 700042RR
Exam Guidelines
Exam Instructions
Question 18 of 20:
Select the best answer for the question
18. The first known bird fossils date to which era of time?
A. Triassic
B. Jurassic
O C. Permian
D. Cambrian
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Which of these is an example of variation? Identical twins having identical DNA.
Two potato plants that are clones of each other.
Two Guinea pigs having different coloured fur.
Two human beings having similar body parts.
Answers
Variation refers to the differences that exist between individuals of the same species. While identical twins have identical DNA, they can still differ in various ways, such as their height, weight, or personality traits. Two potato plants that are clones of each other are genetically identical and therefore do not exhibit variation. Two human beings having similar body parts is a vague statement and does not clearly indicate variation. However, two Guinea pigs having different colored fur is a clear example of variation, as it highlights differences in physical characteristics between two individuals of the same species.
Zeke is working on a big project at work with his colleagues. Zeke's role is considered the Co-ordinator according to Dr. Belbin's Team Roles. What is MOST likely one of Zeke's main responsibilities?
Answers
Answer:
As a Co-ordinator according to Dr. Belbin's Team Roles, Zeke's main responsibility is to identify the talents of each team member and to delegate tasks accordingly.
Explanation:
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Help pls: As the human population has increased over time, wilderness lands have decreased.
What are the two main reasons that wilderness land has decreased?
Select the two correct answers.
• Pollution has harmed wilderness areas.
• Towns and cities have grown and expanded.
• Human activities have caused the climate to change.
• More land is needed for farming and ranching.
• People no longer need or want wilderness areas.
Answers
Answer:
• Pollution has harmed wilderness areas.
• More land is needed for farming and ranching.
Explanation:
A. Charles Darwin became a naturalist, studying the plants and animals around him. B. Charles Darwin observed that similar birds had different markings on the different Galapagos islands. C. Charles Darwin developed a theory based on his observations and interpretations about how natural selection occurred. - Charles Darwin published a book about the theory of evolution that was read by many people who were not scientists
Answers
The correct chronological order of these events is: A -> B -> C -> D.
A. Charles Darwin became a naturalist, studying the plants and animals around him.
B. Charles Darwin observed that similar birds had different markings on the different Galapagos islands.
C. Charles Darwin developed a theory based on his observations and interpretations about how natural selection occurred.
D. Charles Darwin published a book about the theory of evolution that was read by many people who were not scientists.
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In the food chain below each organism will eat ten of the organism below them in the food chain. If there is 1 gram of mercury found in the plant plankton, how much mercury would a person ingest from eating one tuna? (for reference 1 gram = 0.0022)
Answers
The amount of mercury in each organism is going to be ten times greater than that in the organism below it because each organism in the food chain consumes ten times its own weight in food. Therefore, the following formula can be used to determine the amount of mercury in each organism:
Plankton: 1 gramSmall fish: 10 grams (10 x 1 gram)Medium fish: 100 grams (10 x 10 grams)Large fish: 1000 grams (10 x 100 grams)Tuna: 10000 grams (10 x 1000 grams)Therefore, one tuna would contain 10,000 grams, or 10 kilograms, of mercury. When we convert this to grams, we obtain:
10 kg = 10,000 g
By multiplying by the 0.0022 conversion factor, we obtain:
10,000 g times 0.0022 equals 22 grams
Therefore, a person would ingest 22 grams of mercury from eating one tuna.
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Question #6
When building a phylogenetic tree, systematists look at which of the following sources of information? Select all that apply.
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The type of information that is looked at by systematists is B. Genetic data.
What happens when building a phylogenetic tree?Systematists construct a branching diagram to depict the evolutionary history of organisms by using genetic data gathered from them when developing a phylogenetic tree.
This process involves analyzing DNA or protein sequences from various living organisms in order to identify similarities and differences that can be employed to group them into related lineages.
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Options are:
A. Fossil records
B. Genetic data
C. Behavioral observations
D. Weather patterns
7. In the Everglades, a system of canals and levees diverts water to urban areas and the Everglades National Park. This water management system has caused changes in
natural flow of the water during the wet and dry season. Wading birds are especially sensitive to wet and dry seasonal changes. How have water cycle disruptions MOST
affected wading birds?
O The release of water dilutes food sources for their young.
O The higher water levels allow longer-legged birds to survive and reproduce.
O The water quality for feeding has been improved by runoff.
The reduced salinity results in more eggs being laid.
Answers
Answer:
Explanation:
The water cycle disruptions have most affected wading birds by:The release of water dilutes food sources for their young.This is because wading birds depend on the natural flow of water to bring in fish and other small aquatic organisms which are a vital part of their diet. When the water cycle is disrupted by the canals and levees, the water flow changes, and the amount and timing of these organisms can be impacted, making it harder for wading birds to find food for their young. Therefore, option (a) is the correct answer.Option (b) is incorrect because longer-legged birds are not necessarily more adapted to survive in higher water levels.Option (c) is incorrect because water quality may not necessarily improve due to runoff.Option (d) is incorrect because reduced salinity may not be a direct cause of increased egg-laying.