instruction:
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:
Question: What happens to water when it is heated in the broiler? Answer: it expands
answer:
When water is heated in the boiler, it expands. It might burst the pipes of the system if it weren't for the expansion tank. This tank holds excess water after it expands.

question:
Question: What are the tiny sacs in the lungs where gas exchange takes place? Answer: alveoli
answer:
Alveoli are tiny sacs in the lungs where gas exchange takes place.

question:
Question: What important process takes place in specialized tissue inside plant leaves? Answer: photosynthesis
answer:
specialized tissue inside plant leaves where photosynthesis takes place.