what is the tissue grade organization
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Cellular grade of organization. ... A division of labor is evident, so that some cells are concerned with, for example, reproduction, others with nutrition. Such cells do not become organized into true tissues but may form definite patterns or layers. Sponges are at this level of organization.
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early animals
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Cellular grade of organization. ... A division of labor is evident, so that some cells are concerned with, for example, reproduction, others with nutrition. Such cells do not become organized into true tissues but may form definite patterns or layers. Sponges are at this level of organization.
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