Life probably would never have emerged on

Earth if the ancient atmosphere had been the
same as the present one in regard to
a. carbon dioxide.
b. hydrogen.
c. oxygen.
d. nitrogen.
e. carbon monoxide


C

Biology & Microbiology

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Competition shapes communities because there are usually limited 

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Cones are responsible for:a

night vision. b. the detection of movement. c. dim light vision. d. peripheral vision. e. the perception of fine detail

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An example of insoluble fiber is ____.

A. glucose B. starch C. cellulose D. sucrose E. phospholipids

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Eyes contain ____

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