Wassouf Posted October 13, 2004 Posted October 13, 2004 why do humans have lungs as a special feature of gas exchange ?/? (relate to different environments) . i finished my assignment but now those questions are left and i cant find ny answer 4 them. Also why do insects have the tracheal system with all the network? (why is it special structure) FanX
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now