Maintaining a concentration gradient for gases is a problem that large organisms face because diffusion becomes less efficient over larger distance. How do multicellular organisms overcome such problems?
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Card 7
Front
What sort of special adaptation can terrestrial organisms have?
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Card 8
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Many small terrestrial animals use their outer body surfaces efficiently for gas exchange. The earthworm, Lumbricus terrestris, achieves this with:
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Card 9
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The outer body surface of the earthworm is supplied with what?
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Card 10
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How does the earthworm increase the efficiency of diffusion without a heart?
