Placozoans are flat, plate-like animals with no symmetry. They lack organs, muscular and nervous tissues. Answer: D Placozoans have two germ layers, ectoderm, and endoderm, making them diploblastic. They do not have a mesoderm layer. Answer: B and C are incorrect Placozoans are not advanced mesozoans, and they do not have calcareous spicules.

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Placozoans

Question 39

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.

Correct Answer: