Which of these are the two major sources of nitrate pollution in rivers?
a. the burning of fossil fuels by factories and cars
b. animal wastes and the burning of fossil fuels by cars
c. animal wastes and fertilizers
d. fertilizer runoff and the burning of fossil fuels by cars
e. animal wastes and the burning of fossil fuels by factories

The correct option is c) animal wastes and fertilizers

Explanation:

Fertilizers can be described as chemicals which are used by farmers to enhance the production of their crops. Fertilizers contain toxic nitrogenous compounds which when dissolved in river become toxic for the aquatic life and pollute the river. The fertilizers are usually washed of into the rivers during flood or nay other circumstances.

Animal waste also contains toxic nitrogenous compounds which when washed off into the rivers pollute the rivers and seas.