Trichoplax Adhaerens Is the Only Living Species in the Phylum

Multiple Choice

Trichoplax adhaerens is the only living species in the phylum Placozoa. Individuals are about 1 mm wide and only 27 μm high, and are irregularly shaped. There are four types of cells, none of which are nerve or muscle cells, and none of which have cell walls. Individual animals move using cilia, and feed on marine microbes.
The body symmetry of T. adhaerens is likely to be most similar to which of the following groups of organisms?

A) most sponges
B) cnidarians
C) worms
D) tetrapods