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.

Question: Living things get energy from food in a process called respiration, which releases what gas back into the atmosphere? Answer: carbon dioxide
Carbon doesn't stop there. Living things get energy from food in a process called respiration. This releases carbon dioxide back into the atmosphere. The cycle then repeats.

Question: What is the part of the shadow that is partially lit called? Answer: penumbra
The penumbra is the part of the shadow that is partially lit.

Question: What are the three stages of water? Answer: ice, liquid, vapor
(A) Natalie Lucier; (B) Gareth Haywood; (C) Lynn Greyling. Ice, liquid, and water vapor are the three phases of water . (A) CC BY 2.0; (B) CC BY 2.0; (C) Public Domain.