All of the following hypotheses have been suggested to have caused the Permian extinction some 250 myr ago EXCEPT
A) a comet or asteroid hit the Earth and the resulting ash blocked sunlight
B) severe sunspot radiation caused massive mutations
C) a large upswell of water caused global warming
D) volcanic eruptions so severe as to kill off most species
Correct Answer:
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Q22: The principle that claims scientists believe populations
Q23: The best estimate for the date of
Q24: Scientists agree there was a geological separation
Q25: The first fish-like vertebrates in existence 500
Q26: Reptiles differ from amphibians in all of
Q28: All of the following hypotheses have been
Q29: We know when mammals first evolved because
Q30: Earliest mammals probably showed all of the
Q31: The first animals in the Cambrian had
A)
Q32: The Changjiang Formation is important because it
A)
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