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    --> Describe diffusion, osmosis and active transport
    --> Explain why oxygen and glucose need to be absorbed and waste products removed
    --> Compare and contrast either:
    --> Exchange surfaces in mammals and fish
    --> Exchange surfaces in the lungs and the intestines
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    These sound like homework questions which can easily be looked up. Have you tried doing so? Feel free to come back if you're stuck though.
 
 
 
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Updated: September 2, 2016
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