gas exchange in fish, amphibians, insects and reptiles?

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cassannedrah

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doing a past exam q and came across this one, and got a little confused...

explain why specialised gas exchange structures are necessary for the devlopment of larger, more complex animals.
how (with reference to structure and function of gas exchange organs) how insects, fish, amphibians and mammals achieve gas exchange in a) an aquatic environment and b) in a terrestrial environment.

any suggestions, help, etc would be a push in the right direction thanks!!! :):):):)
 
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