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
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Angiosperms that have only one embryonic seed leaf are called:
A. eudicots. B. gnetophytes. C. ginkos. D. monocots. E. bryophytes.
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).
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.
Cones are used for
A. dim light vision B. bright light vision