In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.
Example: Question: Which is an example of a renewable energy resource? Answer: Biomass
Example solution: Biomass is an example of a renewable energy resource.
Example explanation: The output clearly summarizes the question and answer and hence is correct

Problem: Question: Millions of years ago, plants used energy from the sun to form what? Answer: carbon compounds

Solution: Millions of years ago, plants used energy from the sun to form carbon compounds.