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3 / 21  Why are open circulatory systems advantageous to some animals?
A  They use less metabolic energy.
B  They help the animal move faster.
C  They do not need a heart.
D  They help large insects develop.

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Source:  OpenStax, Bmcc 103 - concepts of biology. OpenStax CNX. Aug 06, 2015 Download for free at https://legacy.cnx.org/content/col11855/1.2
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