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Originally Posted by OnyxCougar
Because one type lives underwater, and would REQUIRE a different anatomy than the other, who lives above water?
Edit:
Just like respiratory systems. One type "breathes" water, while the other "breathes" air. Same thing.
I don't understand your confusion on this?
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One breathes oxygen from water, another breathes oxygen from air - all eyes see with light. Cetaceans have inverted retinae.