Wassouf Posted October 13, 2004 Share 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 Link to comment Share on other sites More sharing options...
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