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
(a) Feeding by bear on salmon results in large allochthonous inputs of nutrients into (b) the forest
The domain structures of IgE and IgG
Chemical structures of ester and amide local anesthetics
The ear and its anatomical structures.
Multicelled organism
Chemical structures of the pyrimidines and purines