Final answer:
An organ is a structure made up of different types of tissues that work together to perform a function. Examples include the skin and kidney. Tissues combine to form organs, which are further organized into organ systems to carry out complex functions in the body.
Step-by-step explanation:
An organ is a structure that consists of two or more types of tissues that work together to perform a specific function. Examples of organs include the skin and kidney. Tissues are groups of similar cells that carry out related functions. They combine to form organs, which are further organized into organ systems to perform complex functions within the body. For instance, the circulatory system consists of the heart and blood vessels, while the digestive system includes the stomach, intestines, liver, and pancreas.