why can't some animal species that spend their whole lives in water, breathe in water?
- 8 months ago
well i don't know but i am sure its from mother nature
- RayLv 68 months ago
It is not advantageous for some animals. For example, here in Florida many of the swamps have algae blooms which starves the swamps of oxygen, this kills the fish that exclusively depend on gills but fish who can do both, and reptiles like alligators and turtles thrive in this. They can still like in the swamps as semi aquatic but they can also breathe regardless of how oxygen starved the lakes are.
- Elaine MLv 78 months ago
Same reason birds who spend nearly all their life in the air (albatrosses) still have legs.
They have not adapted completely to the extreme yet.
- οικοςLv 78 months ago
Some animal species do. They range from sponges to fishes and a few amphibians.
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- daniel gLv 78 months ago
Some like whales are mammals and have lungs for gas exchange.
- Anonymous8 months ago
Why haven't you developed intelligence? Nature is full of mysteries.
- A.J.Lv 78 months ago
This is the same basic question as why mammals adapted back into the oceans. Fish have gills to filter dissolved oxygen out of the water. The animals that returned to the water do not have gills. At some point in the past, various animals adapted to more and more water environments for food and escaping certain predators.