Cytokines perform which of the following functions?

A) bringing leukocytes to injured tissue
B) helping leukocytes migrate out of the blood vessels
C) activate leukocytes
D) all of the above


D

Environmental & Atmospheric Sciences

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Indicate whether the statement is true or false.

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The Environmental Protection Agency was created in the mid-1980s

Indicate whether the statement is true or false

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In science, a theory is

A. an explanation supported by a substantial body of evidence. B. a tentative explanation, comparable to a hypothesis. C. speculative and unsupported by facts. D. something that can never be proven wrong.

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Water's salinity can be increased by

A) entering freshwater streams. B) decreased rates of evaporation. C) ice freezing. D) ice melting.

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