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

Ex Input:
Passage: To harness water power, a stream must be dammed. Narrow valleys are the best for dams. While sitting in the reservoir behind the dam, the water has potential energy. Water is allowed to flow downhill into a large turbine. While flowing downhill, the water has kinetic energy. Kinetic energy makes the turbine spin. The turbine is connected to a generator, which makes electricity. Answer: kinetic energy

Ex Output:
Water is allowed to flow downhill into a large turbine to harness power. what helps the turbine spin?

Ex Input:
Passage: Thunderstorms grow where ground temperatures are extremely high. Answer: extremely high

Ex Output:
Are thunderstorms more likely where the ground temperatures are extremely high or extremely low?

Ex Input:
Passage: Like all organisms, plants detect and respond to stimuli in their environment. Unlike animals, plants can't run, fly, or swim toward food or away from danger. They are usually rooted to the soil. Instead, a plant's primary means of response is to change how it is growing. Plants also don't have a nervous system to control their responses. Instead, their responses are generally controlled by hormones , which are chemical messenger molecules. Answer: hormones

Ex Output:
Instead of a nervous system, plant responses are generally controlled by what type of molecules, which serves as chemical messengers?