Overgrowth of algae which produces toxins can be caused by
the water's temperature dropping quickly
too much oxygen in the water
not enough nitrogen in the water
nitrogen runoff from the use of fertilizers near the water

According to the cell theory, which describes cells? a. all organisms are composed of multiple cells. b. all cells have the same structure and function. c. cells are found in everything on earth. d. living organisms are not created spontaneously