High concentrations of fertilizers and nitrates in surface water can cause 1. pH of surface water to increase?
2. temperature of ground water to decrease
3. an increase in dissolved oxygen levels
4. an increase in algae blooms caused by eutrophication

5. what might happen if you were to remove all light from the setup after the discs have all become buoyant? describe what you would see. explain why this would occur with relation to cellular processes like respiration. [referring to an ap biology lab in which spinach discs are placed in a sodium bicarbonate solution and exposed to light.]