Some of the first animals to develop an endoskeleton were _____. mollusks. arthropods. annelids. echinoderms.

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Some of the first animals to develop an endoskeleton were: Echinoderms.

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Asked 4/21/2012 10:34:38 AM

Updated 8/6/2018 10:36:26 AM

1 Answer/Comment

Flagged by andronep [8/6/2018 5:31:14 AM], Unflagged by jeifunk [8/6/2018 10:36:25 AM], Edited by jeifunk [8/6/2018 10:36:26 AM]

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andronep

Some of the first animals to develop an endoskeleton were: Echinoderms.

Added 8/6/2018 5:31:16 AM

This answer has been confirmed as correct and helpful.

Confirmed by jeifunk [8/6/2018 10:36:30 AM], Rated good by jeifunk

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Muscle tissue responsible for movement is _____ muscle. (a)cardiac (b)skeletal (c)smooth

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1 Answer/Comment

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