Members of the phyla Cnidaria and Bryozoa both have a circle of tentacles, which they use for feeding. Besides the difference in size, how else
do these feeding structures differ?
A. Cnidarians have a fixed number of tentacles, but the numbers vary in Bryozoans.
B. Cnidarian tentacles are retractable, but Bryozoan tentacles are nonretractable.
C. Cnidarian tentacles have stinging cells, but Bryozoan tentacles are covered with cilla.
D. Cnidarian tentacles are multicellular, but Bryozoan tentacles consist of a single cell.