Continental drift happened around the Jurassic period, 175 million years ago.
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<span>The types of skeleton depend on where they are located. Earthworms have hydroskeleton because their rigid bodies are based on water pressure so it's hydro then. Endo is found in animals like birds and also humans who have it inside. Exo is found in spiders because they are bugs and bugs have their skeletons like a shell that covers them.</span>
Recombinant DNA is the answer
An organism can "make a living" and survive in its niche.
