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
European wildcat feeding its kittens, as illustrated in Brehm's Life of Animals
Blue whale skeleton, outside the Long Marine Laboratory at the University of California, Santa Cruz
Structures of external, middle, and inner ear
Structures and Functions of the Eye
Options for Legal Structures Cont.
Resonance structures