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 Input:
Question: The atoms of a compound are held together by what type of bonds? Answer: chemical

Ex Output:
The atoms of a compound are held together by chemical bonds.


Ex Input:
Question: What kind of system do echinoderms possess? Answer: water-based circulatory

Ex Output:
Echinoderms possess a water-based circulatory system.


Ex Input:
Question: What are composed of an oxygen atom that forms single bonds with two carbon atoms? Answer: ethers

Ex Output:

Ethers are composed of an oxygen atom that forms single bonds with two carbon atoms.