As air moves away from the tropics and toward the poles, it becomes
a.) cool and dry
b.) cool and moist
c.) warm and dry
d.) warm and moist

Explanation:

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unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.

answer; projective;