The age structure diagram for countries with a

2.1 total fertility rate is indicated by
a. A.
b. B.
c. C.
d. D.
e. none of these.


C

Biology & Microbiology

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Angiosperms that have only one embryonic seed leaf are called:

A. eudicots. B. gnetophytes. C. ginkos. D. monocots. E. bryophytes.

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Microbial fuel cells are an emerging technology whereby ________ are donated to an anode during heterotrophic bacterial respiration.

Fill in the blank(s) with the appropriate word(s).

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Scientists are always thinking about ways to improve experimental design. In the text's potato chip experiment, which

of these changes would produce the most effective design?

a. Show a different movie. b. Exclude teenagers as group members. c. Collect uneaten chip remains and weigh them for both groups. d. Provide free drinks before the experiment. e. Use a smaller theater.

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Cones are used for

A. dim light vision B. bright light vision

Biology & Microbiology