जानवरों का प्रमुख प्रभाग प्रोटोज़ोआ और स्पंज के बिना — metazoa (noun)
Metazoa — 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.
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