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 6/28/2016 11:36:28 AM
Updated 6/28/2016 2:31:18 PM
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jeifunk [6/28/2016 2:31:12 PM], Edited by
jeifunk [6/28/2016 2:31:18 PM]
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