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

Input: Consider Input: Passage: Bacteria are responsible for many types of diseases in humans. Answer: diseases

Output: Bacteria are responsible for many types of what in humans?

Input: Consider Input: Passage: Solar energy travels in photons. Photons travel in waves, which make up electromagnetic radiation. Answer: photons

Output: Solar energy travels in what?

Input: Consider Input: Passage: Scientists think that glycolysis evolved before the other stages of cellular respiration. This is because the other stages need oxygen, whereas glycolysis does not, and there was no oxygen in Earth's atmosphere when life first evolved about 3.5 to 4 billion years ago. Cellular respiration that proceeds without oxygen is called anaerobic respiration . Answer: anaerobic respiration
Output: What do you call cellular respiration that does not need oxygen to proceed?