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

Ex Input:
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

Ex Output:
What is required when electrons are removed from an atom, and released from the process when an electron is added?

Ex Input:
Passage: Telescopes on Earth all have one big problem: incoming light must pass through the atmosphere. This blocks some wavelengths of radiation. Also, motion in the atmosphere distorts light. You see this when you see stars twinkling in the night sky. Many observatories are built on high mountains. There is less air above the telescope, so there is less interference from the atmosphere. Space telescopes avoid problems from the atmosphere completely since they orbit outside the atmosphere. Answer: the atmosphere

Ex Output:
Many observatories are built on high mountains to avoid interference from what?

Ex Input:
Passage: The first vertebrates to live fully on land were amniotes. Amniotes are animals that produce eggs with waterproof membranes. The membranes let gases but not water pass through. They allow embryos to breathe without drying out. Amniotic eggs were the first eggs that could be laid on land. The earliest amniotes evolved about 350 million years ago. Amniotes would eventually evolve into modern reptiles, mammals, and birds. Answer: waterproof

Ex Output:
Amniotes are animals that produce eggs with membranes possessing what property, which allowed them to lay eggs on land?