What is the role of interleukins?
A) chemotaxis of leukocytes
B) production of virally infected cells
C) ensuring production of enough leukocytes
D) signaling between leukocytes
E) complement activation
D
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If the hypothesis stating viruses evolved prior to living organisms on Earth is true, the first type of viruses in the world were likely
A) bacteriophage. B) DNA viruses. C) retroviruses. D) RNA viruses.
Competition occurs (select all that apply):
A. among members of the same species. B. between members of different species. C. only between individuals who share the same realized niche. D. only between individuals in populations that are close to their carrying capacity in the environment. E. none of these.
The fluid that surrounds all the cells of the body is called interstitial fluid.
a. true b. false
Because the natural world includes all energy and matter, it also includes all living organisms
Indicate whether the statement is true or false