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.

what have scientists found to be the most efficient and effective way to insert new sequences into an individual? a-scientists have created genetically altered foods that release dna during digestion. b-scientists use viruses to insert specific gene sequences. c-scientists irradiate genes so that they can be absorbed through the skin.

ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg