AP BIOLOGY

Detailed explanation-1: -Organs are structures made up of two or more tissues organized to carry out a particular function, and groups of organs with related functions make up the different organ systems.

Detailed explanation-2: -A group of organs working together to perform a specific function is called an organ system.

Detailed explanation-3: -organ, in biology, a group of tissues in a living organism that have been adapted to perform a specific function. In higher animals, organs are grouped into organ systems; e.g., the esophagus, stomach, and liver are organs of the digestive system.

Detailed explanation-4: -Organ-a group of tissues precisely arranged so that they can work together to perform specific functions.

Detailed explanation-5: -A group of tissues performing a particular function in the body forms an organ. A group of organs that work together to maintain a stable internal environment and perform a particular function is called as organ system. Thus, the correct answer is ‘Organ.