If the point for a cell to is to make atp, then what is the value of so many steps of the krebs cycle if it makes so little atp

An organ system consists of a group of organs that performs specific functions necessary for the survival of an organism. humans have eleven different organ systems: integumentary, skeletal, muscular, nervous, endocrine, circulatory, lymphatic, respiratory, digestive, urinary, and reproductive. discuss the function of neurons, the brain and the spinal cord within the human nervous system while explaining the interrelationship of each organ.

Study this image which statement best describes the rock shown check all that apply

Why do we perceive objects as retaining their brightness under different lighting levels?