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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 ________.
Pelvic Splanchnic Nerves
Nerves that arise from the sacral spinal cord, innervating the lower abdomen, pelvis, and contributing to the function of urinary and reproductive organs.
Parasympathetic Division
A division of the autonomic nervous system that conserves energy by slowing the heart rate and increasing digestive and glandular activities.
Postganglionic Neurons
Neurons that transmit impulses away from ganglia (collections of nerve cell bodies) in the autonomic nervous system to a target organ or tissue.
Terminal Ganglia
Groups of nerve cells situated close to or inside the organs they supply nerves to, playing a role in the autonomic nervous system.
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