input:  Now, answer this question: Answer the following question given this paragraph:   Many species have a feeding structure, the radula , found only in mollusks. The radula can be thought of as a "tongue-like" structure. The radula is made mostly of chitin. Types of radulae range from structures used to scrape algae off of rocks to the beaks of squid and octopuses.   Q: What is the radula made mostly of?   A:
A:
output: chitin

input:  Now, answer this question: Answer the following question given this paragraph:   A single-replacement reaction is one in which an element replaces another element in a compound. An element is in either the solid, liquid, or gas state and is not an ion. The example below shows the reaction of solid magnesium metal with aqueous silver nitrate to form aqueous magnesium nitrate and silver metal.   Q: In this type of reaction, an element replaces another element in a compound, and the element is in any state of matter but is not an ion?   A:
A:
output: single-replacement reaction

input:  Now, answer this question: Answer the following question given this paragraph:   Triglycerides function as a long-term storage form of energy in the human body. Because of the long carbon chains, triglycerides are nearly nonpolar molecules and thus do not dissolve readily in polar solvents such as water. Instead, oils and fats are soluble in nonpolar organic solvents such as hexane and ethers.   Q: What substances function as a long-term energy store in the human body and possess long carbon chains that prevent dissolving in water?   A:
A:
output:
triglycerides