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frez [133]
3 years ago
11

21. Cells of the immune system are able to respond to the presence of

Biology
1 answer:
ratelena [41]3 years ago
8 0

Answer:

1.  antigens present on the invaders

Explanation:

Through the antigens present to the invaders the Cells of the immune system can easily able to respond and recognize.  During an infection, chemical signals attract phagocytes to places where the pathogen has invaded the body. 

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The answer is; D

This is referred to as co-evolution. It involves the reciprocal evolution of 2 species. This kind of evolution can be seen in mutualism (like the choices described above), and also predator-prey, host-parasite relationships. The term co-evolution was coined by Paul R. Ehrlich and Peter H. Raven in 1964.

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IgorLugansk [536]
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Hi!! Help with these biology questions would be greatly appreciated! Thank you!
OverLord2011 [107]

Answer:

A

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4 0
3 years ago
Explain how the taiga is different from the other forest ecosystems.
serg [7]

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Brainliest?

3 0
2 years ago
Biodiversity decreases the stability of an ecosystem and decreases the
Effectus [21]

Answer: false

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