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.

[EX Q]: Question: A statement that describes what always happens under certain conditions in nature is also known as what? Answer: scientific law
[EX A]: A statement that describes what always happens under certain conditions in nature is also known as scientific law.

[EX Q]: Question: Where does chemical digestion mainly occur? Answer: small intestine
[EX A]: Chemical digestion mainly occurs in the small intestine.

[EX Q]: Question: What branch of science is defined as the study of matter? Answer: chemistry
[EX A]:
Chemistry is defined as the study of matter.