Why do we not know whether bipedalism developed quickly or gradually?
A) The fossil record is very slim for the period between 8 million and 4 million years ago.
B) There are very many bipedal hominoids, but very few quadrupedal ones for comparison.
C) Bipedalism seems to have appeared and disappeared from the fossil within a few million years.
D) There are no transitional or early bipedal fossils through which we can study the development of bipedalism.
Correct Answer:
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