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Why Just Five Digits on Tetrapod Limbs?

Two family members each possessing an extra digit on each limb find that having a sixth finger is beneficial and useful.

Darwin Fish Lacks Tetrapod Legs

You can see a transition between a fish and a land creature in fossils and genes only if you have a vivid imagination.

Fishy Tales About Tetrapod Origins

It's a stretch for mutation and selection to make a fish crawl out onto land with four digitized limbs, to say nothing of lungs and a new body plan.
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