Stuff evoution can't explain

Richard Dawkins' The Ancestor's Tale fails to explain some facts:

1) Why heavy fish, like whales, don't just sink to the bottom of the ocean
2) Why most trees are so much taller than necessary
3) How non-biological animals, like crocodiles and ostriches, came into existence
4) Why sharks haven't grown legs, moved onto land and taken over the world
5) The existence of invisible species that remain undiscovered

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