How do pikas breathe?

machine head by bush

We breathe in oxygen and breathe out carbon dioxide.

Oxygen in, Carbon Dioxide out.Another answerBreathing breathes in the atmosphere: not the whole atmosphere obviously, but its composition. Breathing in occurs because of the necessity of...

4 to 5 little pikas a litter<3

While our bodies do need some nitrogen, we do not obtain this from the atmosphere. Environmental nitrogen exists in a form that can't be properly anabolised into the correct molecules (eg. urea/amino...