Here's why:

* Form Follows Function: The way something is built (its structure) determines what it can do (its function).

* Examples:

* Bones: Strong, hard structure provides support and protection.

* Muscles: Fibrous structure allows for contraction and movement.

* Lungs: Air sacs with a large surface area enable efficient gas exchange.

The structure-function relationship is a fundamental concept in biology. It helps us understand how living organisms work at all levels, from the molecular to the organ system.