Post History
It's quite possible, and some animals already have them. Some arachnids have what are known as book lungs - small respiratory cavities that actually are not lungs, but different respiratory organs...
Answer
#1: Attribution notice removed
by
System
·
2020-06-01T14:13:47Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/31121 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/