Why Do We Not Know Whether Bipedalism Developed Quickly or Gradually

question 34

Multiple Choice

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.

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