Most vertebrates have a--- digestive system incomplete tube within a tube sac-oike none of the above

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asked Feb 12, 2019 72.0k views

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Yegeniy · Answer 1 · 2019-02-17T23:21:55+0000

Most vertebrates have a tube within a tube. The skin forms a tube that is open at the mouth and the anus. The mouth and the anus are the ends of another tube found inside the tube of skin.

Most vertebrates have a--- digestive system incomplete tube within a tube sac-oike none of the above

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