Which level of biological organization includes multiple organs working together to perform a bodily function?

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

Answer: (C)

Organ systems are the level at which several organs collaborate to perform a bodily function. Each organ handles a part of the task, and together they enable the organism to carry out complex processes like digestion, circulation, or respiration. For example, the digestive system includes the mouth, stomach, intestines, liver, and pancreas; these organs work in sequence and together to break down food, extract nutrients, and absorb them. In contrast, cells are the basic units, tissues are groups of similar cells, and the biosphere refers to all ecosystems on Earth. So, the level that includes multiple organs working together to perform a bodily function is an organ system.