Refer to the Figure Showing an Acorn Worm (Top) and Pterobranchs

question 150

Multiple Choice

Refer to the figure showing an acorn worm (top) and pterobranchs (bottom) . Which statement regarding structure and function of body parts in the hemichordates shown is false?

• A) Pterobranchs live in a tube secreted by the proboscis.
• B) In acorn worms, cilia convey mucus and its attached prey to the mouth.
• C) In pterobranchs, tentacles from the collar capture small prey.
• D) Acorn worms possess a proboscis and trunk but no collar.
• E) Acorn worms breathe by pumping water into the mouth and out through the pharyngeal slits.

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