The amount of ultraviolet radiation hitting the Earth's surface is greatly reduced by which gas in the atmosphere?

a. ozone
b. oxygen
c. water
d. carbon dioxide
e. nitrogen vapor


Answer: a. ozone

Biology & Microbiology

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__________________ Indicate whether the statement is true or false.

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The degree of parental investment required often results in the nonrandom mating behavior called ________.

A. fidelity B. allopatry C. mate choice D. preferability

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