Which is a reason for the rise of nitrate levels in ground water?
a) overuse of fertilizers
b) ammonification by animals
c) soil erosion at grasslands
d) nitrogen fixation by azotobacter

Analyze the central conflict and its in a story to discover the theme. o resolution o protagonist antagonist character

Which is an example of a population?

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.