Nitrogen is a limiting factor in aquatic ecosystems. Suppose that runoff from a field washes nitrogen rich fertilizer into a pond containing a population of algae. Predict how the fertilizer will affect the carrying capacity of the pond for algae. 

Fill in the blank with the best word to complete the sentence. white blood cells protect against and aid in blood clotting when injuries are sustained.

There are few cells in the body that do not undergo mitosis: most somatic cells divide regularly, some more than others. take for example the cells that line the digestive tract. these cells must be frequently replaced because they are constantly eroded by the movement of food through the tract. what mechanism(s) is/are in place to ensure that these cells are exact copies of the mother cell

Can sexual intercourse affect your body in any way that you are harmed?