Respond to statements 151–155 in reference to the five animal
phyla listed below.
a. Annelida
b. Arthropoda
c. Mollusca
d. Echinodermata
e. Rotifera
D 151. Trilobites were members of this phylum.
M 152. The larval stage in this phylum has bilateral
symmetry, whereas the adult stage exhibits radial
symmetry.
M 153. Although most members are enclosed by hardened
shells, this phylum name literally means “soft body.”
E 154. This phylum has the greatest number of species.
D 155. “Wheel animals” are in this phylum.
Answers: 151. b, 152. d, 153. c, 154. b, 155. e
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