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?

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

Answer 1

Answer: a water vascular system

Step-by-step explanation:

The water vascular system is very common among the echinoderm organisms. It is a hydraulic system. It is seen among marine organisms such as sea stars as well as in sea urchins. This system helps in the process of locomotion, waste transportation, as well as in respiration. This system is composed of canals which are connected to various tube feet.

The water vascular system can help in the identification of the given unidentified organism.