Which level of organization includes multiple organs working together?

• A. Organ
• B. Organ System
• C. Tissue
• D. Cell

Answer: (B)

Think about how the body is organized: cells form tissues, tissues form organs, and organs with other organs in systems carry out broad functions. A tissue is a group of similar cells; an organ is made of tissues that perform a specific job. When several organs work together to achieve related goals, they make up an organ system, like the digestive system or circulatory system. The question asks which level includes multiple organs working together, and that is an organ system. For example, the digestive system relies on the stomach, intestines, liver, and other organs to break down food and absorb nutrients in a coordinated way. The other levels are smaller: a single organ, a tissue, or a cell.