How is genetic variation maintained in most populations?

A) through inbreeding
B) through cloning
C) through sexual reproduction
D) through biotechnology
E) through asexual reproduction


Answer: C

Environmental & Atmospheric Sciences

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Metals are relatively more abundant in

A. new stars. B. old stars. C. neither in particular

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Of central importance in a tug-of-way match is

A. increased tension in the rope. B. friction between the feet and ground. C. one's grip on the rope. D. staying power.

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________ denotes the vast amount of time that precedes the Paleozoic Era.

A. Cenozoic B. Quaternary C. Mesozoic D. Paleozoic E. Precambrian

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The cascading forward motion of breaking waves as they rush upon the shore is called ________

A) an oscillation wave B) swash C) backwash D) wave refraction E) a littoral current

Environmental & Atmospheric Sciences