TASK DEFINITION: Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.
PROBLEM: Question: Which cycle tracks the flow of nitrogen through an ecosystem? Answer: nitrogen cycle

SOLUTION: Mariana Ruiz Villarreal (LadyofHats) for CK-12 Foundation. The nitrogen cycle tracks the flow of nitrogen through an ecosystem . CC BY-NC 3.0.

PROBLEM: Question: Which law means that the simplest of competing theories is most likely to be correct? Answer: law of parsimony

SOLUTION: The formation of scientific theories is generally guided by the law of parsimony. According to this law, the simplest of competing theories is most likely to be correct.

PROBLEM: Question: The major cause of outdoor air pollution is the burning of? Answer: fossil fuels

SOLUTION:
The major cause of outdoor air pollution is the burning of fossil fuels.