One of the major threats to more than 90 percent of endangered species is ____

a. habitat loss
b. air pollution
c. water pollution
d. radioactivity
e. ozone depletion


ANSWER: a

Biology & Microbiology

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Blood contains

a. dissolved gases. b. dissolved nutrients. c. dissolved hormones. d. all of the above.

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A higher rate of eye infections can be expected from a person who ________.

A. cannot produce tears B. has a vitamin deficiency C. is very young D. wears glasses

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Which molecule is a "metabolic taxicab" that shuttles electrons?

A) OAA B) NADH C) ATP D) ADP

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A human sperm cell possesses autosomes and

A) a Y chromosome always. B) exactly the same genetic information as a body cell. C) both an X and a Y chromosome. D) an X chromosome always. E) either an X or a Y chromosome.

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