Why did animal life originate in the oceans rather than on the land?

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Why did animal life originate in the oceans rather than on the land?

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It all comes down to ozone. Back before oxygen was released into the atmosphere and converted from O2 (oxygen) into O3 (ozone) the sun was a deadly laser that would give off a lot of radiation. So life could only exist under the sea where it had some protection.

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.*