Question

Answer pls urgent
Class 7 science
Biology

Answer 1

Answer:

Whales and Dolphins keep coming up to the water surface because they don't have Gills like other fishes which helps them to take the oxygen dissolved in water. dolphins do not have gill like other fishes . so they come up to the water surface to give out the carbon dioxide.

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Answer 2

they release the water which they first inhaled....and then they can live up to hours in deep water...........they come to inhale water or breath

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