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: What catalyst substances may also allow reactions to occur by different pathways that have lower activation energy? Answer: enzymes

SOLUTION: Enzymes may also allow reactions to occur by different pathways that have lower activation energy.

PROBLEM: Question: What element can form two different compounds with oxygen? Answer: carbon

SOLUTION: Carbon can form two different compounds with oxygen.

PROBLEM: Question: What is the hardest type of coal? Answer: anthracite

SOLUTION:
5. Anthracite is the hardest type of coal because it is metamorphic. Anthracite causes less pollution when it burns. Why do you think that is?.