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> Complex life forms existed 1.5B years earlier than believed

I think it would be more correct to say "It's now believed that complex life forms existed 1.5B years earlier than believed earlier"

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So far no reasons to think so. The article lacks details. But for complex life to emerge in small pocket that oasis would have to exist for many millions of years. No proof of that. Then organism is not a bunch of single cellars in one place. This is another question here. Next there are intermediate forms of life which bundle together only for some time. This thing looks like single organism while it isn't.

Than previously believed.

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