I think its pulmonary circulation too.
Terrestrial planet.
Terrestrial brings like us and animals live whereas as others don't satisfy any life.
B.) is the answer. I think it is. I'm not completely sure. But I think this is the right answer. Can you mark me brainliest if it is please.
Breathing is the exchange of gases between animals & the environment.
If you write in english language maybe i can help you
