If the last common ancestor of chimpanzees and hominins was not a knucklewalker, knucklewalking developed before hominins existed.

Name: If the last common ancestor of chimpanzees and hominins was not a knucklewalker, knucklewalking developed before hominins existed.
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If the last common ancestor was not a knucklewalker, then knucklewalking would have developed independently in the lineages leading to modern chimpanzees and gorillas after they diverged from the hominin lineage.

If the Last Common Ancestor of Chimpanzees and Hominins Was