Which of the Following Is Not a Feature of the Tube-

question 20

Multiple Choice

Which of the following is not a feature of the tube- within- a- tube body plan in most animals?

• A) The inner tube consists of digestive organs.
• B) Typically, the mouth and anus form the ends of the inner tube.
• C) The two "tubes" are separated by mesoderm tissue.
• D) Typically, the outer tube consists of a hard exoskeleton.

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