Because cells consume 02 and release CO2 as waste. So the composition changes
their gills
No, there is still some air left inside the lungs.
alveoli
Yes they do. The shells of the eggs are permeable - meaning it allows moisture and air to penetrate inside. The growing reptile absorbs oxygen through the egg membrane as it develops.
yes they have lungs to breathe
That's right, cats breathe with their lungs, just as people do. All mammals use lungs to breathe.
Yes. Alligators breathe with lungs.
Reptiles always breathe with lungs. Amphibians may breathe with lungs, gills or through their skin.
Bats breathe through their mouths and noses.
Yes, snakes breathe air and they have lungs.
Yes; lizards do use lungs to breathe.
the lungs will moves down when breathe out air