We find it difficult to believe that all of these changes could occur more than once.
Dan Gebo
They don't all look alike. There are some very different shapes, with implications of how these fossils walked.
fossils
There may have been competition with other apes over resources in the shrinking forest.
competition forest
The reason we stood up is the million-dollar question in anthropology.
reason question anthropology
This is hard to explain, but easy to demonstrate.
hard easy
find difficult
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