Flatworms were one of the first to develop a ______ , which allowed them to detect light, food, and mates.
Flatworms were one of the first to develop a head, which allowed them to detect light, food, and mates.
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Asked 7/1/2016 7:09:06 AM
Updated 7/1/2016 7:50:33 AM
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jeifunk [7/1/2016 7:50:26 AM], Edited by
jeifunk [7/1/2016 7:50:33 AM]
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