Habiba E.

asked • 06/22/22

grade 11simple bio question

 All vertebrates possess similar digestive systems. The vertebrate digestive systems can be described as having a tube-within-a-tube structure. The outer tube of the tube-within-a-tube structure is the 

  1. Body
  2. Digestive trace
  3. Esophageal canal
  4. Inner lining of the digestive tube


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