Placozoans

Multiple Choice

Placozoans

A) are flat,plate-like animals with no symmetry.
B) are probably advanced mesozoans.
C) have calcareous spicules.
D) have three germ layers.Placozoans lack symmetry and any organs,muscular,and nervous tissues.Their dorsal and ventral epithelial layers may be ectodermal and endodermal tissue layers,thus some zoologists consider placozoans to be diplobastic.