30 POINTS// please answer this question! :)

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.

Which kingdom includes some organisms that have no nucleus and can live in an environment with an extremely high salt content

Are the layers of rock above and below the coal older or younger?