Explain why genetic variation within a population is a prerequisite for evolution

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.

This is so important ugh its 25 points

Omg substrates with the same size and shape as the active site will bind to the enzyme. why is the key labeled the “bad” substrate?