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Was there a time when only marine life existed?

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At some point far back in time, a common ancestor gave rise to two main groups of life: bacteria and archaea. .... read more

For most of the history of life on Earth the only life was marine, and in a way all life is STILL marine. From 3.8 billion to 460 million years ago (approximately) all life on earth was delegated to the oceans. read more

When we look back through the geological record, we see that for much of the last 500 million years there was an abundance of life in the oceans and that atmospheric carbon dioxide was much higher than today for the vast majority of that time. read more

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Chapter 17 – The History of Life - ppt video online download
Source: slideplayer.com

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