A stalked, sessile marine organism has several feathery feeding structures surro

Question

A stalked, sessile marine organism has several feathery feeding structures surrounding an opening through which food enters. The organism could potentially be a cnidarian, a lophophorate, a tube-dwelling worm, a crustacean, or an echinoderm. Which of the following traits, if found in this organism, would allow the greatest certainty of identification?

Select one:

a nervous system

the presence of what seems to be radial symmetry

a digestive system with mouth and anus separate from each other

a hard covering made partly of calcium carbonate

a water vascular system

Explanation / Answer

The correct answer is a water vascular system.

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