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4 / 21  Some animals use diffusion instead of a circulatory system. Examples include:
A  birds and jellyfish
B  flatworms and arthropods
C  mollusks and jellyfish
D  None of the above

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Source:  OpenStax, Biology. OpenStax CNX. Feb 29, 2016 Download for free at http://cnx.org/content/col11448/1.10
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