identify the choices that best complete the statement or answer the question

The human body has three lines of defense.

-The first line of defense is physical and chemical barriers, such as the skin, mucous membranes, enzymes, stomach acids, and antimicrobial molecules.

-The second line of defense corresponds to nonspecific innate responses, cellular responses, for example, the phagocytes, proteins, for example, the complement system, and other responses like fever and inflammation.

-The third barrier of defense corresponds to the adaptative immune system and it consists of the immune response carried on by the T-cells, B-cells, and antibodies.

All of the options are parts of the three lines of defense of the organism, A and B correspond to the first line of defense, C corresponds to the second line of defense, and D corresponds to the third line of defense.

None of the given options is a correct answer to the question.

Answer:

The nervous system transmits signals between the brain and the rest of the body, including internal organs.

Explanation:

The nervous system's activity controls the ability to move, breathe, see, think, and more.

Answer:

All of the choices are correct.

Explanation:

Large intestine aka colon is smaller than small intestine but wider than it and contains a variety of living bacteria.

Transposable elements are DNA sequences, genes. With the capacity to move inside the genome, that is to say, they can change their position in the genome by themselves. Due to this ability to change position, they have been widely studied, although many times insert themselves on inactive genomic regions, they have contributed to genetic diversity and generating polymorphisms, which in turn have an impact on the evolution. Also in a low percentage of cases can generate genetic illnesses in early embryonal states, like some ehemofilias or leukemias.

Answer: Asexual Reproduction

Explanation:

Budding and spore formation are two types of  asexual reproduction methods. Hence, gamete formation and fertilization do not occur in both types. Both cases involve a single organism or a parent. Also, the offspring is genetically identical to that of the parent in both methods.

Answer: Rigid motions preserve collinearity. Reflections, rotations, and translations are all rigid motions. So, they all preserve distance, angle measure, betweenness, ...

3 pages

Explanation:

ALWAYS AND FOREVER

Answer:

Associates: 60

Bachelors: 120

Masters: 30-60

Doctorate: 60-120

All cancers begin with a gene mutation giving rise to a faulty protein participating in cell reproduction, even if it is a minor change that occured in this protein. The major problem is that the cell will divide itself nonstop, forming a mass of mutated cells (a tumor). If they start to divide in an undifferentiated way, it can even access other tissues and becom a more serious problem. But, in order to define what causes a tumor at first, the uncontrolled cell division is the beginning of it all.

Therefore, the correct answer is D. uncontrolled cell division

What creates most pollution is the burning of fossil fuels to produce energy for eletricity and transportation, because of the release of carbon dio

Answer:

Germination

Explanation:

The beggining growth of the plant

Answer:

Germination

Explanation:

It's when the seed takes water from the soil. This trigger root growth to allow the seed get more water. It then develops and grows towards the sun above ground

The two molecules that are major electron acceptors in the catabolic pathways are NAD⁺ and FAD⁺, whereas  NADH and FADH₂ can be considered as electron carriers.  They play a fundamental role to produce energy as ATP.

The electron carriers are specific molecules that act during cellular respiration in order produce Adenosine triphosphate from ADP and phosphate, which is the energy coin of the cell.

Therefore, with this data, we can see that the electron carriers such as  NADH and FADH₂ are fundamental for producing ATP, while NAD⁺ and FAD⁺ accept electrons during this process.

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1. a. What are the different environment that are home to various kind of organisms?

b. What are the environmental factors affecting the population size of a certain species?

c. How can an organism adapt to different kinds of environment?

The first question is regarding biosphere. The second is about carrying capacity. The third is about adaptation.

Facilitated diffusion is the process by which molecules diffuse across the plasma membrane with the assistance of membrane proteins like channels and carriers.

Diffusion is the flow of chemicals across a biological membrane from an area of higher concentration to one of lower concentration, and it is facilitated by the usage of a transport molecule.

Because substances move in the direction of their concentration gradient, chemical energy is not directly needed.

Solutes diffuse through transport proteins in the plasma membrane when their diffusion is facilitated. A form of passive transport is facilitated diffusion.

Therefore, facilitated diffusion across a biological membrane requires transport proteins and moves a substance down its concentration gradient.

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Answer: The answer would be CLASS.

Explanation: If we refer to the taxonomic level of classification,

Domain

Kingdom

Phylum

Class

Order

Family

Genus

Species

we can see that CLASS ranks higher compared to Family. So, the Class has a wide range of genera that will belong to it than Family.

The pressure would be changed to 4 atm in the machine to bring 500 ml of air into the lungs.

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Answer:

The B is the correct ANSWER.

Explanation:

Answer: Fish!

Explanation:

If it were a mammal, It would live birth only, Frogs do not have scales, Reptiles have egg-birth only.

When these two gametes (an egg and a sperm) combine with each other, the process is known as fertilization (as we can see in the third answer option), and this is achieved by these two sexual cells by a set of physiological reactions in which both cells are involved, for example, they can chemically attract between each other. After this process, also known as fecundation, there would be the formation of a zygote, which will end in the formation of an embryo after embryogenesis. We can see this graphically in the picture below, where there're a sperm and an egg with their parts.

The structure of venous valves in the large veins of the extremities is that the the valves in the veins are hemispherical in shape and are made up of Elastic tissue. These valves are lined by the endothelium like the rest of the veins. Beneath this endothelium, elastic tissue is present in the form layers or lamellae.

The functions of the of venous valves in the large veins of the extremities is  is to keep the blood moving in one direction which is back up towards the heart.

Veins are regarded as blood vessels located throughout your body that collect oxygen-poor blood and return it to your heart.

Veins are generally part of your circulatory system which work together with other blood vessels and the heart to keep blood moving in the body.

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Answer:

The answer is A

Explanation:

An ecologist studies the relationship between living things and their habitats.

Answer:

Kudzu was intentionally introduced to North America by the Soil Erosion Service and Civilian Conservation Corps in the 1930s for the purpose of controlling soil erosion in the American Southeast.

Hi. We just had a session with this same question is there any doubt left?

Lymph, which is a substance different from the blood that carries out nutrients from the extracellular media of the different tissues of our body, flows through specific vessels, known as lymphatic vessels, so they don't go directly through the arteries, as we can see in the following picture:

One environmental drawback of using the franking process to extract natural gas from shale, is air pollution.

Methane is a main component of natural gas and is 25 times more potent in trapping heat in the atmosphere than carbon dioxide. A number of other air contaminants are released through the various drilling procedures, including construction and operation of the well site, transport of the materials and equipment, and disposal of the waste. Some of the pollutants released by drilling include: benzene, toluene, xylene and ethyl benzene (BTEX), particulate matter and dust, ground level ozone, or smog, nitrogen oxides, carbon monoxide, formaldehyde and metals contained in diesel fuel combustion---with exposure to these pollutants known to cause short-term illness, cancer, organ damage, nervous system disorders and birth defects or even death .

The case the exersice tells is an example of how introduced subtances to a particular environment have a negative impact on the species' health, as states the C answer option: "factors in the environment can change the characteristic

Answer:

Duck-billed platypus and spiny anteater

The first event would be the formation of the earth, since in the beginning, conditions were so extreme that life was not possible. The next event would be the origin of life which occurred with the first prokaryotic cells since they are simple cells in structure. Later, there would be eukaryotes, more complex cells, with a nucleus and other organelles such as mitochondria. Eventually, the interaction between cells gave rise to multicellularity and with this, the multicellular organisms were formed, the first ones being plants, followed by reptiles in the Carboniferous and mammals in the Jurassic period. And because primates are mammals, they would be in the last place.

As w know in mendelian genetics, a heterozygous organism has two allele versions, meanwhile, a homozygous organism has both copies equal, so homozygotes are also called purebred and heterozygotes hybrids, so the correct answer is option C.

Solution:

The three-domain system is a biological classification introduced by Carl Woese et al (Fox). in the year 1990. In this classification, the cellular life forms are divided into the following 3 domains;

1. Archaea,

2. Bacteria and

3. Eukaryotes.

So that, we can conclude that the correct answer is:

C) WOESE AND FOX.

Answer:

Explanation:

B correct me if im wrong.

Answer:  The correct answer is irrigation system

Explanation:  This answer has been confirmed correct.