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    How does diffusion limit the size of an organism? How is this counteracted?

    Diffusion is effective over a very short distance. If a cell exceeds this distance in its size, the center of the cell cannot get adequate nutrients nor can it expel enough waste to survive. To compensate for this, cells can loosely adhere to each other in a liquid medium, or develop into multi-celled organisms that use circulatory and respiratory systems to deliver nutrients and remove wastes.

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Source:  OpenStax, Biology 1308 bonus credit chapters--from openstax "biology". OpenStax CNX. Apr 25, 2013 Download for free at https://legacy.cnx.org/content/col11516/1.2
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