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What are four levels of organization in a multicellular organism?

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Quick Answer

The five levels of organization in a multicellular organism are cells, tissues, organs, organ systems and organisms. The level of complexity and functionality increases going from cells to organisms.

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Full Answer

Cells are the basic unit of a multicellular organism. Humans have many types of cells, including blood cells, nerve cells and bone cells. Cells with similar structure and function merge to form tissues such as epithelial or connective tissue.

Organs, such as the heart or kidney, are composed of different types of tissue to perform a specific function. Organs come together to constitute organ systems such as the nervous system, digestive system and immune system. Together, these organ systems make up an organism.

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