Prior to the formation of the protostar, ________
A) nuclear fusion does not occur
B) the interstellar clouds are composed of equal amounts of hydrogen and helium
C) the temperature of the cloud is greater than 10,000 K
D) nuclear fusion converts hydrogen to helium
A
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The renewable and perpetual resources with the best availability in the short term and the long term are
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Why is a stream able to pick up a grain of sand, but not a smaller grain of silt?
A) Gravity forces the silt to remain on the ground. B) Certain patterns of water flow work better for larger particles. C) Adhesion keeps the silt particles attached to the rock below. D) Cohesion keeps the silt particles attached to each other.
The greatest human impacts on ocean ecosystems are concentrated
A) in the northern hemisphere. B) around Australia. C) around South America. D) in the eastern Pacific.
List the social costs incurred when the responsibility for providing water falls to the women and children of a village
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