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Author Question: Against which hard structure do the circular and longitudinal muscles of annelid (Read 769 times)

Charlie

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on: Aug 5, 2013
Against which hard structure do the circular and longitudinal muscles of annelids work?
A) bristles
B) cuticle
C) shell
D) endoskeleton
E) hydrostatic skeleton


camila

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Reply #1 on: Aug 8, 2013
Answer has to be E, trust me!


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Charlie

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Reply #2 on: Oct 18, 2013
Wonderful, you were right, thank you so much.


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