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.

Ex Input:
Question: Mixtures of materials called alloys contain at least one of what type of material? Answer: metal

Ex Output:
Alloys are mixtures of materials, at least one of which is a metal.

Ex Input:
Question: The metacarpophalangeal joints in the finger are examples of what kind of joints? Answer: condyloid

Ex Output:
Figure 38.30 The metacarpophalangeal joints in the finger are examples of condyloid joints. (credit: modification of work by Gray's Anatomy).

Ex Input:
Question: Ether molecules have an oxygen atom and can engage in hydrogen bonding with which other molecules? Answer: water

Ex Output:
Ether molecules have an oxygen atom and can engage in hydrogen bonding with water molecules. An ether molecule has about the same solubility in water as the alcohol that is isomeric with it.