Which of the following examples best describes a disturbance that is likely to result in significant, long-lasting changes to an ecosystem?
Choose 1 answer:
Choose 1 answer:
(Choice A)
A
A frost in late spring kills some of the earliest budding plants and flowers in a field.
(Choice B)
B
Tens of thousands of geese rest for a week at a large lake during their annual migration.
(Choice C)
C
The failure of a 60-year-old beaver dam floods a downstream meadow.
The failure of a 60-year-old beaver dam floods a downstream meadow best describes a disturbance that is likely to result in significant, long-lasting changes to an ecosystem
It cause immense damage to the property, habitats due to water flooding over them.What is a dam?A dam is a barrier that stops or restrict the flow of surface water or underground streams.It is build across the stream or river to hold water back.It can used to store water, control floods and generate electricity.
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Hemolysis is:
O A) when a red blood cell is in a hypertonic solution and the cell ruptures
O B) when a red blood cell is in a hypotonic solution and the cell ruptures
O C) when a red blood cell is in a hypotonic solution and the cell shrinks
O D) when a red blood cell is in a hypertonic solution and the cell shrinks
The movement of the outer core is
important to life because...
Answer:
he movement causes powerful electric currents to develop in the liquid iron itself.
Explanation:
In carbon dioxide (CO2), there are two oxygen atoms for each carbon atom. Each oxygen atom forms a double bond with carbon, so the molecule contains two sets of double bonds. Two sets of double bonds means that the total number of electrons being shared in the molecule is two. four. six. eight.
Answer:
Eight
Explanation:
In a single bond there are 2 electrons
In a double bond there are 4 electrons
Two double bonds = 8 electrons
Answer:the answer would be eight hope this helps
Explanation:
what type of stress is placed on a normal fault
the ability of a solution to change the shape or tone of the cell
Answer:
tonicity
Explanation:
this i the ability of a solution to change the shape (tone) of a cell by altering it's internal water volume
The carbohydrate molecule ____
is a powerhouse energy source.
A) Glucose
B) sucrose
C) lipid
D) amino acid
The carbohydrate molecule ____ is a powerhouse energy source.
→ A) Glucose
Researchers identify a gene in cockroaches that is responsible for their ability of nerve regeneration. How might it be possible for this gene to be used in treating human paralysis?
This gene could be analyzed to determine its homology level with a human gene, which then could be restored in its normal expression. This strategy can restore the normal phenotype in defective human cells.
Sequence homology, which refers to the level of evolutionary relationship among genetic or proteins sequences, is a fundamental subject matter to determine gene function.
From this approach (sequence homology search), researchers can identify valuable genes involved in diseases in which the restoration of their normal expression levels can be used to restore the normal phenotype in defective cells.
In this case, the identification of a gene in cockroaches that is responsible for nerve regeneration could be used for subsequent identification of a human homologous gene sequence, which then can be restored in order to treat human paralysis.
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When an unbalanced force acts on an object, in which direction does the object
move?
The object moves in the direction of the net force.
The object moves in the direction of the smaller force.
The object moves in the opposite direction of the unbalanced force.
The object moves in the direction of the unbalanced force.
Answer:
Explanation:
The object moves in the direction of the net force. It depends on what you have been told. I would say that A is the correct answer.
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A
Both the forces shown above are unbalanced. But the object will not move in the direction of either of them. The net force is somewhere between the two given forces and that's the direction of the motion.
Matter begins to move through this food chain when the?
Answer: When the energy of the sun is captured by plants.
If each of these food chains start with 10,000 grams of phytoplankton, how much reaches the highest trophic level in each food chain
Energy is transferred from one trophic level in a food chain to another. However, not all the energy available at a trophic level is transferred to the next.
Only about 10% of the energy in the lower trophic level gets to the immediate higher trophic level and the rest is lost as metabolic heat.
Thus, if a food chain starts with 10,000 grams of phytoplankton, the quantity that will get to the highest trophic level would depend on the number of intermediate trophic levels in between the lowest and the highest.
For every step the energy is transferred up the trophic level in the food chain, 90% of it is lost.
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How does one distinguish
between the left & right
sides of a heart?
Answer:
See explanation section for answer:
Explanation:
The left side of the heart contains the left atrium which allows oxygen rich blood to flow through the mitral valve and into the left ventricle. Whereas the right side of the heart contains the right atrium which allows the blood with poor oxygen levels to enter the right ventricle through the tricuspid valve.
Also, the left ventricle is larger than the right ventricle because the left ventricle is responsible for pumping the fresh oxygen rich blood throughout the body.
If a brown-eyed mother and a blue-eyed father have four children, three will probably have brown eyes. What can you conclude from this?
A. Brown eyes are a successive trait
B. Brown eyes are a submissive trait
C. Brown eyes are a recessive trait
D. Brown eyes are a dominant trait
Answer:
D. Brown eyes are a Dominant Trait
Explanation:
Mark and Michelle both have dark hair, which is a dominant trait. But their first child is blonde. Which is the most likely explanation
Answer:
They are heterozygous for the dark hair.
El acero es homogénea,heterogénea,elemento,compuesto?
Answer:
El acero es una mezcla homogénea, sin embargo, está hecho de hierro y carbono. Una sustancia pura es diferente de una mezcla homogénea porque una sustancia pura tiene un solo componente.
Which method of timber harvesting removes all trees from the harvest area?
which of the following can cause polyploidy
A : a single egg fertilized by two sperm
B: a diploid egg being fertilized by a normal sperm
C: a normal egg being fertilized by a diploid sperm
D : all of the above
Explanation:
a polypiody is a condition that has more than 2 sets of chromosomes. common in plants..
explain why calcuim and phosphorus from bone are important to the human body
Answer:
the mineral calcium helps your muscles, nerves, and cells work normally. Your body also needs calcium (as well as phosphorus) to make healthy bones. Bones are the main storage site of calcium in the body
what is the cytoplasm job in the factory?
Answer:
factory floor!
Explanation:
function:
Contains the organelles; site of most cell activity.
What do you think would happen if the mitotic spindle did not function correctly?
Answer:
The presence of extra centrosomes leads to the formation of a multipolar mitotic spindle, which, if not corrected prior to anaphase, results in the segregation of chromosomes into more than two daughter cells.
Explanation:
How the plants survive in tropical rainforest?
Answer:
The plants have adapted to the rainforest environment by growing their roots deep into the ground and extending their leaves high into the tree canopy to receive sunlight for photosynthesis. Mant plants have adapted to the immense amount or water they are exposed to in their environment.e
Which RNA molecule is involved in translating a short sequence of RNA into an amino acid, acting like a molecular Rosetta stone?
a
snRNA
b
tRNA
c
mRNA
d
rRNA
Given what we know about the translation process, we can confirm that the RNA in question that aids in the process of translating a short sequence of RNA into an amino acid is mRNA.
mRNA is referred to as messenger RNA. This RNA molecule acts as just that, a messenger carrying the necessary code to create amino acids and therefore, proteins. This messenger binds itself to the ribosomes of a cell, which are in charge of reading the code, one codon at a time, and chaining together the corresponding amino acids.
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A person who has type AB blood:
Answer:
B-positive (B+): 9%
AB-positive (AB+): 4%
A-positive (A+): 30%
if bird cannot migrate what it does to survive
If you make mutations in the nuclear localization signal of a nuclear protein, what will happen to the protein
Answer:
What would happen if the operator sequence of the trp operon contained a mutation that prevented the repressor protein from binding to the operator? a. In the absence of tryptophan, the genes trpA-E will not be transcribed. b. In the absence of tryptophan, only genes trpE and trpD will be transcribed. c. In the presence of tryptophan, the genes trpA-E will be transcribed. d. In the presence of tryptophan, the trpE gene will not be transcribed.
Explanation:
Hey, I need help with this question:
Answer:
(D) two different species on the basis os reproductive behaviour
BRAINLIST PLS
Punnet Squares
A couple have 4 children, their first child has blood type A. the second child has blood type O. The third child has blood type AB, and the fourth has blood type B. What are the genotypes of the parents?
Answer:
a and ab blood types
Explanation:
Which one of the following fuels directly produces CO2 but is considered carbon neutral?
Question 2 options:
a)
Wind
b)
Biomass
c)
Oil
d)
Coal
e)
Hydropower
Answer:
A. wind
B. coal
Explanation:
there are two fuels directly produces CO2 but is considered carbon neutral which are wind and coal
Which side is hypertonic ? A or B ?
Which side will gain water
What is c ?
Answer:
1-b
2-b
3-phospholipid bilayer
B side is hypertonic. It will gain water. C is Phospholipid layer.
What is Hypotonic Solution?
A hypotonic solution is a type of solution that has a lower osmotic pressure than any other solution to which it is compared. It is a solution in which a small amount of solute passes across a semipermeable membrane compared to the amount of solute in the other solution.
If the solute concentration outside the cell is lower than inside the cell, these solutes cannot cross the membrane, so the solution is hypotonic to the cell.
The cell membrane consists of a phospholipid bilayer containing embedded proteins present between these two solutions where a hypotonic solution has a relatively low concentration of solutes.
Thus, B side is hypertonic. It will gain water. C is Phospholipid layer.
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An man about 80 years old, lives alone. He looks very weak and undernourished. His lower limbs bones are tender and thin. Due to poor diet and loneliness, he lacks the essential vitamins and minerals for his bone formation. Explain bone formation (ossification) , and bone marrow formation which this man is lacking.
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All bone formation is a replacement process. During development, tissues are replaced by bone during the ossification process. In intramembranous ossification, bone develops directly from sheets of mesenchymal connective tissue. In endochondral ossification, bone develops by replacing hyaline cartilage, bone formation, also called ossification, process by which new bone is produced. ... Soon after the osteoid is laid down, inorganic salts are deposited in it to form the hardened material recognized as mineralized bone. The cartilage cells die out and are replaced by osteoblasts clustered in ossification centres.
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