Question

give reason fish can breathe underwater but we cannot​

Answer 1

Answer:

The main reason why gills work for fish is the fact that fish are cold-blooded, which reduces their oxygen demands. ... Humans cannot breathe underwater because our lungs do not have enough surface area to absorb enough oxygen from water, and the lining in our lungs is adapted to handle air rather than water

Answer 2

Answer:

Because fish have gills which help them to breathe even in water but we don't have.

That's why fish can breathe even inside water but we can't.

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