To review:
The differences among the cell, tissue, organ, organ system and organism.
Introduction:
The complexity of an organization depends upon the level of organization. A single cell organism consists of a single cell. A group of a cell performing a specific function in a similar manner is known as a tissue. The tissue forms an organ, which has specific functions. A group of organs performing different functions of a system of the body is known as an organ system. The combination of different organ system constitutes an organism.

Explanation of Solution
The cells are the fundamental and the smallest unit of life. The cell is the basis of an organism. The cell is considered as the smallest unit that is living and is also capable to grow. These cells are organized in a functional manner in a multicellular organism. The cells that function in a similar manner are known as a tissue.
The organs are the structures made up of tissues to perform a specific task by working together. The multiple numbers of organs working together for their specific functions forming a system of the body are known as an organ system. The number of organ systems performing different functions in the body of an organism is known as an organism. Therefore, there are different levels of organization in an organism. The different levels of organizations differ in their complexity based on their functions.
The various levels of organization in an organism differ on the basis of their functions and the complexity of their organizations.
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Chapter 11 Solutions
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