How many times could a human female ovulate in her lifetime?
a. about 40
b. about 400
c. about 4000
d. about 40 000
Ans: b. about 400
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The largest mass of living material on Earth comes from
A) microorganisms. B) plants. C) animals. D) plants and animals together.
A structure composed of nervous tissue along with other tissues that enhance its response to a certain type of stimulus is called a(n) __________.
a) sense organ b) receptor c) transducer d) initiator e) activator
Which microtubule type is paired to its correct function?
A. Polar microtubules - positioning of the spindle apparatus B. Aster microtubules - positioning of the spindle apparatus C. Kinetochore microtubules - separate the poles D. Polar microtubules - bind kinetochore to centromere
The primary cause of desertification in the world today is
a. increased salinity resulting from irrigation practices. b. overgrazing of marginal lands. c. clearing and degradation of tropical forests. d. herbicide and fertilizer runoff. e. use of water for industry.