Why aren't some crocodilians fully aquatic?

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Science & Mathematics by Anonymous 2018-06-01 11:03:54

Social Science

Why aren't some crocodilians fully aquatic?

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I know that some crocodilians need to travel to different bodies of water but other crocs, suchus the saltwater crocodile, can swim in the ocean. How come they haven't evolved to become fully aquatic if they benefit from the water so greatly?