Final answer:
An organ system is a set of interrelated parts that work together to achieve a common purpose in biology.
Step-by-step explanation:
An organ system is a set of interrelated parts that work together to achieve a common purpose. In biology, this concept refers to how organs work together to perform specific functions in a living organism. For example, the cardiovascular system includes the heart, blood vessels, and blood, which work together to transport oxygen and nutrients throughout the body.