The gold in Uncle Harry's teeth fillings originated in
A. stars that blew up eons ago.
B. fusion processes that date back about 5.5 billion years.
C. Fort Knox.
D. the deep interior of the Earth.
E. the Big Bang.
Answer: A
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The key special chemical used by chemosynthetic communities at hot vents is ________.
A. silicate B. nitrate C. phosphate D. methane E. hydrogen sulfide
____________________, which includes more than 175 nations—is responsible for the international exchange of weather data and certifies that the observation procedures do not vary among nations
Fill in the blank with correct word.
The largest Russian oblasts are in the:
A) west B) northwest C) southwest D) east
In an ecosystem, the elimination of one new species by another because of direct competition for the same resources is an example of
A) intraspecific competition. B) the competitive exclusion principle. C) character displacement. D) resource partitioning.