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Meaning Of Metazoa
n. pl.
Those animals in which the protoplasmic mass,
constituting the egg, is converted into a multitude of cells, which are
metamorphosed into the tissues of the body. A central cavity is
commonly developed, and the cells around it are at first arranged in
two layers, -- the ectoderm and endoderm. The group comprises nearly
all animals except the Protozoa.