EVERYDAY SCIENCE

Detailed explanation-1: -An organ system is a higher level of organization that consists of functionally related organs. Mammals have many organ systems. For instance, the circulatory system transports blood through the body and to and from the lungs; it includes organs such as the heart and blood vessels.

Detailed explanation-2: -A group of organs working together to perform a specific function is called an organ system. An example of an organ system is the circulatory system, which includes different organs like the heart, arteries, veins, and capillaries.

Detailed explanation-3: -The function of an organ system depends on the integrated activity of its organs. For instance, digestive system organs cooperate to process food. The survival of the organism depends on the integrated activity of all the organ systems, often coordinated by the endocrine and nervous systems.

Detailed explanation-4: -An organ system is a group of organs that work together in the body to perform a complex function, such as pumping blood or processing and utilizing nutrients.

Detailed explanation-5: -The correct answer is (d) Organ level.