青蛙水下呼吸

Can frog breathe underwater?

The answer is yes.

A frog has two ways of breathing.It can breathe air into its lungs much as you do.It also can do some of its breathing through its skin.
That means it can get some oxygen from water around it and get rid of carbon dioxide too .

When you scare a frog sitting at the edge of a pond,it takes a big gulp of air as it dives in.The frog is not very active underwater and doesn’t need to breathe very fast.
So,once the gulp of air is used up,the frg continues to breathe through its skin.That works all right if the water is cool,
but it doesn’t work so well if the water is warm.Warm water doesn’t hold as much oxygen.And warm water speeds up the frog’s
metabolism so that it needs more oxygen.Soon it will come out for a real breath of air.

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