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Trichoplax adhaerens is the only living species in the phylum Placozoa. Individuals are about 1 mm wide and only 27 μm high, are irregularly shaped, and consist of a total of about 2,000 cells, which are diploid (2n = 12). 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 any "edge" can lead. T. adhaerens feeds on marine microbes, mostly unicellular green algae, by crawling atop the algae and trapping it between its ventral surface and the substrate. Enzymes are then secreted onto the algae, and the resulting nutrients are absorbed. T. adhaerens sperm cells have never been observed, nor have embryos past the 64-cell (blastula) stage.
t. adhaerens' body symmetry seems to be most like that of ________.
A) most sponges
B) cnidarians
C) worms
D) tetrapods

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T. adhaerens' irregular shape and absence of true tissues or organs suggest that its body symmetry is most similar to that of sponges. Cnidarians, worms, and tetrapods all have more defined body shapes and tissues than T. adhaerens.

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