If the whole earth was under water covering the tallest mountains then it must have contained salt water covering the earth.
Water is very heavy and it must have penetrated the weakest parts of the earths surface..
Once the waters subsided we are left with salty seas ,freshwater lakes and streams,and underground streams of fresh water .
The Oceans are salt water , the rivers and streams and lakes are mostly freshwater .
The majority of life in the oceans would not survive in freshwater
By the same token the majority of life in freshwater lakes ,rivers and streams would not survive in salt water.
So if a Noachian flood did actually occur how would life have continued to exist in the oceans (salt) and the rivers ,lakes ,streams.(salt free) ?
Or am I missing something here.