The level of organization that includes cells of similar structure and function is called tissues.
Tissues are a group of many similar cells, though sometimes composed of a few related types, which work together in order to perform a specific function. A distinct structure of the body called organ, which anatomically composes of two or more tissue types.
In tissue level of organization, all the cells performing similar functions group together to form a unit called tissue. Groups of cells join together to form a tissue and this kind of organization is seen in some animals, where the tissues perform specific functions.
Hence, the level of organization which includes cells of similar structure and function is called tissues.
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