Answer:
B)
Explanation:
their DNA are similar
they are able to reproduce
they are of same species
When DNA is binding proteins, the genes within it tend to be inaccessible and silent; that is, they rarely code for protein
Cell's origin will influence which genes it turn to make protein. This is called a DNA sequence
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The adaptive immune response is the second line of defense against non-self pathogens. Adaptive immunity, also known as acquired immunity or specific immunity, is found only in vertebrates.
<h3>What is second line of defense?</h3>
Nonspecific resistance, which destroys invaders without targeting specific individuals, is the second line of defense: phagocytic cells ingest and destroy all microbes that enter body tissues.
The adaptive immune response is the body's second line of defense against non-self pathogens. Adaptive immunity, also known as acquired immunity or specific immunity, is found only in vertebrates.
Thus, adaptive immune system is a natural, nonspecific immune response, but it is part of the body's second line of defense.
For more details regarding second-line defense, visit:
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yes, coral polyps are a keystone species. it would be a keystone species because it is important in order for the coral to thrive.
its answer is A.
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