how do planarla obtain oxygen?

Question

Please help!!!
Thank you.

Answer 1

Planaria breathe by direct gas exchange via the exterior of its body. That is, oxygen diffuses in through the skin, and carbon dioxide diffuses out through the skin. Earthworms do the same. There are no lungs or gills. Their skins have to be moist for this to work.

You probably should have asked this in the biology section.