question: What sentence would provide a factual answer to this question: "What orbits the earth 13 times per year?"

answer: the moon orbiting the Earth approximately occurs 13 times per year

question: What sentence would provide a factual answer to this question: "heat and pressure change the remains of what into natural gas?"

answer: heat and pressure change the remains of prehistoric living things into natural gas

question: What sentence would provide a factual answer to this question: "If an environment experiences harsh climates"

answer:
a greenhouse is used to protect plants by keeping them warm