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stiv31 [10]
3 years ago
8

What is a anatomical barrier

Biology
2 answers:
Hatshy [7]3 years ago
8 0
Anatomical barriers of the immune system. Your immune system is comprised of two main halves: the inate immune system and the adaptive immune system. The former is the primary line of defense in your body’s fight against pathogens, (which are invaders that enter your body) that are always trying to harm it. Hoped that was of assistance!!!!
KengaRu [80]3 years ago
4 0
Well first, your immune system has two main halves, innate and adaptive... the innate is the line of defense to fight off disease and bacteria, which is made up of anatomical barriers 
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A & C

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The _______ two objects are to each other, the stronger the force of gravity is between them.
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closer

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The closer two objects are to each other, the stronger the force of gravity is between them.

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3 years ago
During drought years, seeds with thin coats are more likely to desiccate (dry out) and not be able to germinate
Morgarella [4.7K]

Directional selection favors one of the extreme phenotypes. Option B). Fewer plants with thin seed coats will be able to germinate, leading to a higher proportion of plants that produce seeds with thick seed coats.

<h3>What is directional selection?</h3>

Directional selection increases in the proportion of individuals with an extreme phenotypic trait.

There must be a selective pressure or environmental pressure acting on populations to lead the species to increase the number of individuals expressing that extreme phenotype.

This selection presents more frequently in those cases in which interactions between living organisms and the environment modify in the same direction.

In the exposed example the environmental pressure is drought during several years.

Drought periods decreases the fitness of plants that produce thin seed coats because they dehydrate before germinating.

Originally the population expressed both types of seeds. But after the drought pressure, only plants that produce seeds with thicker coats got to survive and reproduce.

The correct option is B). Fewer plants with thin seed coats will be able to germinate, leading to a higher proportion of plants that produce seeds with thick seed coats.

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5 0
2 years ago
Darwin also observed fossil shells of marine organisms high up in the Andes mountains, and saw an earthquake move land that was
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Geological events can cause drastic changes over long periods of times

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He used these insights and stated that Geological events can cause drastic changes over long periods of time. Such changes can cause entire species to become extinct or cause drastic evolutionary physical changes to other species. This is because the environment changes and the animals living in these environments need to adapt in order to be able to survive. Some changes such as continental drift can even move species to different parts of the world where the climate is drastically different.

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3 years ago
A normal cell in an adult woman has?
Assoli18 [71]

Answer:

The correct answer will be option-A.

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The females carry two X-chromosomes in their cells but one of these X-chromosome gets permanently inactivated during embryonic development.

The X-inactivation is known as lyonization which ensures that only one functional X-chromosome should be present like in males.  This process is a random process and therefore a female can have both the functional X-chromosomes and males can also have a functional X-chromosome.

Thus, option-A is the correct answer.

3 0
3 years ago
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