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.
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i believe the answer is 300. ;)
C. because stimuli is how your body responds to something, and in this case, someone's heart rate increases WHEN their blood oxygen drop. Do you see how it responds? ;-)
PLEASE HELPPP :,,,,,,,,,,,)
dem82 [27]
I believe the answer is A
Hope this helps!
