Given a scientific passage and an answer, generate a question for the given answer.

Example Input: Passage: Energy is absorbed in the process of converting a liquid at its boiling point into a gas. As with the melting of a solid, the temperature of a boiling liquid remains constant and the input of energy goes into changing the state. The molar heat of vaporization of a substance is the heat absorbed by one mole of that substance as it is converted from a liquid to a gas. As a gas condenses to a liquid, heat is released. The molar heat of condensation of a substance is the heat released by one mole of that substance as it is converted from a gas to a liquid. Since vaporization and condensation of a given substance are the exact opposite processes, the numerical value of the molar heat of vaporization is the same as the numerical value of the molar heat of condensation, but opposite in sign. In other words, . Answer: gas
Example Output: Energy is absorbed in the process of converting a liquid at its boiling point into a what?

Example Input: Passage: Modern reptiles live in many different habitats. They can be found on every continent except Antarctica. Answer: reptiles
Example Output: Modern members of what broad animal group live in many different habitats and are found on every continent except antarctica?

Example Input: Passage: The majority of human genes have two or more possible alleles , which are alternative forms of a gene. Differences in alleles account for the considerable genetic variation among people. In fact, most human genetic variation is the result of differences in individual DNA bases within alleles. Answer: a vestigial structure
Example Output:
The structure of the human tail bone is called what?