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

Example Input: Passage: Population density is the average number of individuals in a population per unit of area or volume. For example, a population of 100 insects that live in an area of 100 square meters has a density of 1 insect per square meter. If the same population lives in an area of only 1 square meter, what is its density? Which population is more crowded? How might crowding affect the health of a population?. Answer: population density
Example Output: What is the term for the average number of individuals in a population per unit of area or volume?

Example Input: Passage: The menstrual cycle includes events that take place in the ovary, such as ovulation. Answer: ovary
Example Output: Ovulation takes place in what organ and is part of the menstrual cycle?

Example Input: Passage: Junctions are areas between cells that either allow or prevent the movement of materials. Junctions are usually composed of numerous proteins, forming a large molecular complex. Gap junctions, desmosomes and tight junctions are three examples of junctions. Answer: junctions
Example Output:
What are the areas between cells that either allow or prevent the movement of materials called?