Why did animal life originate in the oceans rather than on the land?
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Life in general originated in the oceans, it split into animal, plant and fungi and others long before any of them specialized to work outside of the water.
We are really just bits of chemistry floating in water, when we walked on land we took our original environment with us inside us.
There is no reason why life might not as well have originated on land at or in the air at first, but it didn’t.
It is thought that the water made it easier for life to evolve. But that is just a snake biting its own tale: *It is easier to evolve in water for the sort of live that evolved in water.*
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