Yes.
No. They breath using their lungs or with their lungs, but not "through" their lungs. They do however breath "through" their blowholes (to get the air in and out of their lungs).
Crocs don't breath underwater. They have lungs and breathe air pretty much like you and I. Thye hold their breath while diving.
Yes. Crocodiles do not have gills, as they hold their breath when underwater.
you breath it in and the air goes into your lungs and helps pump the blood around
Reptiles breathe air - through their lungs.
Yes, they do have lungs as they need to breath air.
We get rid of waste when we breath out and when we breath in we take oxygen in to our lungs and breath.
Yes, all penguins have lungs.
Whales breath air using their lungs.
They only have one respriatory system and it is similar to humans. They breath oxygen from ther air with their lungs. When they are underwater they simply hold their breath (and can do so for a very long time). They do not breath water with gills like fish.
yes
yes