Which of the following polymers contain nitrogen? A) starch
B) glycogen
C) cellulose
D) wax
E) hemoglobin

What advantages does a pedigree have over a written passage?

Which of the following types of pollution is most responsible for large numbers of deaths worldwide because of unsafe drinking water? (a) nutrient pollution (b) thermal pollution (c) pathogen pollution (d) sediment pollution

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.