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) the presence of what seems to be radial symmetry
B) a hard covering made partly of calcium carbonate
C) a digestive system with mouth and anus separate from each other
D) a water vascular system
E) a nervous system
An example of anatomical homology: homologous structures found in vertebrates.
The Brain and It's Structures
Sources and Amounts of Oil Released into North American Marine Waters
The salivary glands and related structures of the oral cavity.
Breast-Feeding at Work Can Work
Summary of the Structures of the Eyeball