As tadpoles they have gills and swim in the water all day, but when they become frogs they produce lungs and lungs need oxygen. So yes they do need oxygen.
Yes, as remember, all creatures neeed air-oxygen, to survive.
Frogs eat flies and bad bugs so we wont get sting by bees and other stuff. Frogs help by farting oxygen so we have more oxygen to breathe
Frogs, like all other reptiles, get their oxygen through their lungs
Lungs and moist skin.
They only USE one lung, but they have two.
No.
I don't.
when frogs come onto the land they need oxygen from the air,this wax coating dissolves oxygen in it and the frog can breathe easily.also this prevent the water to flow across its skin membrane due to osmosis.
Frogs have underdeveloped lungs, so they must have a moist skin so that oxygen can diffuse into their bodies. Their lungs do not function well enough to be used on their own.
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Yes. They can also absorb moisture through their skin.