yes
Fog or Clouds. Fog because fog is also called haze. And clouds because whats actually happening is the water droplets from your breath are slightly freezing. They freeze that fast because they're are so small and they are also mix with carbon dioxide coming out of your lungs.
Interesting question. Helium has an exceptionally low heat capacity (no vibrational or rotational modes), but theoretically it would be possible if the helium were cold enough and there were enough of it. If you're asking if room temperature helium has some magical lung-freezing power... no, it does not.
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).
They Breath through their lungs!
Bats are mammals and breath using lungs.
Mammals breath using lungs.
When you inhale, you breath in oxygen and your lungs get bigger.
they breath with lungs
You use your lungs to breath. Your heart pumps the blood round your body (including into and out of the lungs where gas exchange occurs when you breath).
Sea cows are mammals, and breath with lungs.
You have lungs because they help you breath in and out
Humans cannot breathe underwater because our lungs do not have enough surface area to absorb enough oxygen from water, and the lining in our lungs is adapted to handle air rather than water.