HELPP PLEASE WITH THIS QUESTION PICTURE ABOVE!!

Secondary pollutants are more harmful than primary pollutants. select the best answer from the choices provided ot of

What does it mean for a cell membrane to be selectively permable

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.