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

Example Input: Passage: When you use a machine, you apply force to the machine. This force is called the input force. The machine, in turn, applies force to an object. This force is called the output force. The output force may or may not be the same as the input force. The force you apply to the machine is applied over a given distance, called the input distance. The force applied by the machine to the object is also applied over a distance, called the output distance. The output distance may or may not be the same as the input distance. Answer: output force
Example Output: What do you call the force a machine applies to an object?

Example Input: Passage: Biotic factors are all of the living or once-living aspects of the environment. They include all the organisms that live there as well as the remains of dead organisms. Answer: biotic factors
Example Output: What are all of the living or once-living aspects of the environment called?

Example Input: Passage: All of the populations that live in the same area make up a community . The community that includes the goldfish population also includes the populations of other fish, coral and other organisms. Answer: a community
Example Output:
The populations that live in the same area form this?