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

Ex Input:
Passage: Although lots of symbiotic relationships help both organisms, sometimes one of the organisms is harmed. When that happens, the organism that benefits, and is not harmed, is called a parasite . This type of relationship is known as parasitism. Answer: parasite

Ex Output:
Although lots of symbiotic relationships help both organisms, sometimes one of the organisms is harmed. when that happens, the organism that benefits, and is not harmed, is called a what?

Ex Input:
Passage: Refracting and reflecting telescopes are optical telescopes that use lenses to gather light. Answer: light

Ex Output:
Refracting and reflecting telescopes are optical telescopes that use lenses to gather what?

Ex Input:
Passage: The population growth rate is how fast a population is growing. The letter r stands for the growth rate. The growth rate equals the number of new members added to the population in a year for each 100 members already in the population. The growth rate includes new members added to the population and old members removed from the population. Births add new members to the population. Deaths remove members from the population. The formula for population growth rate is:. Answer: growth rate

Ex Output:
What term that shows how fast a population is growing includes new members added to the population over a given period, as well as old members removed from the population?