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What were the first animals to develop an endoskeleton?
Echinoderms were the first animals to develop an endoskeleton.
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Asked 4/6/2011 10:28:20 AM
Updated 11/25/2015 4:10:14 PM
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Edited by Janet17 [11/25/2015 4:10:14 PM]
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Echinoderms were the first animals to develop an endoskeleton.

Added 11/25/2015 3:53:17 PM
This answer has been confirmed as correct and helpful.
Confirmed by Janet17 [11/25/2015 4:10:48 PM]
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What were the first animals to develop an endoskeleton?
Weegy: The echinoderms (Phylum Echinodermata) were the first animals to develop an endoskeleton. (More)
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Updated 11/25/2015 4:11:43 PM
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