What do bacteria, fox glove, Mexican yam, and the rauwolfia plant have in common?
A. They all have been discovered by biologists in the last 25 years
B. They all have exciting possibilities for use as human food
C. They all are wild species providing us with important medicines
D. They all grow in the same tropical ecosystem
Answer: C
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Which is the more accurate measure for showing the rate and probability of reproduction among fertile females?
A. crude birth rate B. total fertility rate
Western boundary currents: a. transport water in a diffuse, ill defined stream
b. are relatively shallow, broad and slow. c. transport enormous volumes of water. d. carry cool polar water toward the equator.
The inner core is
a. liquid due to its low density. b. liquid due to the intense heat at the center of the Earth. c. solid due to the immense pressure at the center of Earth. d. liquid due to its iron content. e. solid due to its iron content.
Why were planets called "wanderers" by early Astronomers?
A) They move relative to the stars. B) They move relative to the North Star, but not other stars. C) They move in random paths across the sky due to their complex orbits around the Sun. D) They move relative to the moon because of their orbits around the earth.