_____ ____ work cooperatively to perform necessary life functions.

• A. Cell groups
• B. Organ systems
• C. Body tissues
• D. Nervous tissues

Answer: (B)

Organ systems are groups of organs that work together to perform the functions necessary for life. This cooperation across different organs allows the body to carry out broad tasks like digestion, circulation, respiration, and maintaining stable internal conditions. While cells form tissues that perform specific roles, it takes multiple organ systems to coordinate these processes and keep the organism functioning. For example, the respiratory and circulatory systems work together to exchange gases and transport them to tissues, and the nervous and endocrine systems help regulate the speed and control of these activities. So, the idea of multiple parts acting in concert to support life points to organ systems as the correct concept.