When did life in the ocean begin?

It is said that Earth was created about 4.5 billion years ago (bya). Life began about (note “about”) 3.5 bya. And, in fact, it is thought that life began in the oceans!

Follow the evolution of the whale on the National Museum of Natural History’s Sant Oceans Hall on-line ocean portal and see if the whale is evolving backwards. Sounds interesting, eh?

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