Which of the following best describes the transfer of nitrates and the impact on the environment and human health?
(a) nitrates increase the growth of algae in surface water bodies, killing fish. (b) detergents containing nitrates are carried from land to water by rain, contaminating drinking water and causing digestive problems in humans. (c) nitrates from leaky septic tanks enter the groundwater and are converted in the human body into nitrites, which are poisonous and could be fatal for infants. (d) nitrates increase the amount of organic substances in water and lowers the amount of dissolved oxygen, killing fish.