One of the most fundamental relationships in biology is between structure and function.
The principle that structure determines function is fundamental to biology. In other words, how something is set up within an organism allows it to carry out its function (a living thing). Relationships between structure and function are produced by natural selection.
The term "structure" describes the way the (body) is put together, including the bones, muscles, tendons, and ligaments. Next, move on to the cellular level of the organ structure. The function is the way that (the body) operates.
For example, the fundamental units of all living things are cells. There are many billions of cells in the human body. They give the body structure, absorb nutrients from meals, turn those nutrients into energy, and perform certain tasks.
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