15-10-2018
Biology

contestada

most vertebrates have a--- digestive system

incomplete

tube within a tube

sac-oike

none of the above

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nplawyer74 nplawyer74

11-12-2018

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.

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