instruction:
Given a scientific passage and an answer, generate a question for the given answer.
question:
Passage: When electrons are removed from an atom, that process requires energy to pull the electron away from the nucleus. Addition of an electron releases energy from the process. Answer: energy
answer:
What is required when electrons are removed from an atom, and released from the process when an electron is added?

question:
Passage: Monarch butterflies gather in large groups as they migrate 2,500 miles south each fall. They return to the north in the spring. This migration is a cycle that repeats every year. Answer: migration
answer:
What do we call the seasonal movement of animals?

question:
Passage: The combined gas law relates pressure, volume, and temperature of a gas. Answer: combines gas law
answer:
Which law relates the pressure, volume, and temperature of a gas?