A group of organs working to perform vital bodily functions

• A. Tissues
• B. Cells
• C. Population
• D. Organ System

Answer: (D)

A group of organs working together to perform vital bodily functions is an organ system. Organs like the heart, lungs, stomach, and liver each handle a specific job, and when they cooperate, they coordinate to sustain life—circulating blood, exchanging gases, processing nutrients, and more. This level sits above tissues and cells: tissues are groups of similar cells, organs are structures made of different tissues, and organ systems are networks of multiple organs functioning together. A population, by contrast, refers to a group of individuals of the same species in an area, not to bodily organization. Examples of organ systems include the circulatory, respiratory, and digestive systems.