>> I'm not sure that's as much of a problem as you think it is for anything
>> other than fish.
>
>    Well, life on Earth was completely in water for the first... what?
> 3 billion years?

Wikipedia (which is always right) asserts that "life" began 3.8 billion 
years ago, and land plants appeared 475 million years ago.

3,800 - 475 = 3,325 million years = 3.3 billion years with no life on land.

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