What is most likely the amount of energy available at a trophic level of primary consumers if the amount of energy available to producers in that food web is 2,000 kilocalories?

Anything about the same as 2,000 kilocalories.

If the producers are plants / algae, and contain 2,000 kilocalories of energy, the primary consumers, which are the ones eating the plants / algae will obtain about the same amount of energy the producers originally have.

Hope it helped,

BioTeacher101

answer; the above answer to the above statement is (true)

sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.