Why can't living things be smaller than a cell and still be considered alive?

Explain the side effects of cancer treatments

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.

Explain the source of radioactivity in uranium in earth’s crust by which it produces nuclear radiation