The adjustable ring of contractile and connective tissues that controls the amount of light entering the eye is the ____
a. lens
b. cornea
c. pupil
d. iris
e. retina
ANSWER: d
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A. guttation. B. cohesion. C. phloem loading. D. mesophyll adhesion. E. aeration.
Animals that are likely to be severely affected by DDT include:
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How old is the oldest fossil we have food of our own species, Homo sapiens?
A. About 3 thousand years old B. About 6 million years old C. About 6 thousand years old D. About 300 thousand years old
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plants with pink, red, and white roses. b. plants with only pink roses. c. plants with red or white roses in a 3:1 ratio. d. plants with white or red roses in a 3:1 ratio. e. plants with only red roses.