In which of the following locations does carbon

remain free for the shortest time?
a. peat bogs
b. tropical forests
c. marshes
d. oceans
e. the arctic


Answer: b

Biology & Microbiology

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Suberin is a waxy substance that is typically associated with the

a. primary xylem. b. root hairs. c. endodermis. d. tonoplasts. e. pericycle.

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After replication of a DNA molecule is completed, two molecules are present: the original DNA and a

newly synthesized DNA. Indicate whether the statement is true or false.

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When plants first colonized land, the space they occupied was two-dimensional: the surface of the land. Which adaptation allowed plants to occupy a three-dimensional environment?

A) double fertilization B) seeds C) vascular system D) flowers

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