What is the leading cause of water pollution in the united states?
a. point source pollution
b. nonpoint source pollution
c. lack of regulation
d. none of the above

The correct answer is option B

The leading cause of water pollution in the United States is non point source. The non point source of water pollution can be pollutants coming from different sources.

These sources can be from agricultural sources( pesticides an fertilizers) industrial waste( liquid wastes from the industries of various types) Domestic wastes, et cetera.

well for one plants are always the producer, so a is the answer. a wolf is more of the consumer(predator) and the deer is the prey so i know those two are out of the question. also mushrooms are fungi/fungus so a is the producer.