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Trichoplax adhaerens (Tp) 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 2000 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. They move using cilia, and any "edge" can lead. Tp 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. Tp sperm cells have never been observed, nor have embryos past the 64-cell (blastula) stage.
Tp's body symmetry seems to be most like that of ________.
A) most sponges
B) cnidarians
C) worms
D) tetrapods

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Tp's irregular body shape and lack of tissue organization suggest a similarity to sponges, which also lack true tissues and have an asymmetrical body plan. Cnidarians have radial symmetry, worms have bilateral symmetry, and tetrapods have four-limbed symmetry, none of which match the characteristics of Tp.

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