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

Input: Consider Input: Passage: Chemical cells are found in batteries. They produce voltage by means of chemical reactions. Chemical cells have two electrodes, which are strips of different materials, such as zinc and carbon. The electrodes are suspended in an electrolyte. This is a substance that contains free ions, which can carry electric current. The electrolyte may be either a paste, in which case the cell is called a dry cell, or a liquid, in which case the cell is called a wet cell. Flashlight batteries contain dry cells. Car batteries contain wet cells. Answer: chemical

Output: Batteries produce voltage through what type of reaction?

Input: Consider Input: Passage: From a human point of view, natural resources can be classified as either renewable or nonrenewable. Answer: renewable or nonrenewable

Output: How can natural resources be classified from a human point of view?

Input: Consider Input: Passage: The second line of defense attacks pathogens that manage to enter the body. It includes the inflammatory response and phagocytosis by nonspecific leukocytes. Answer: second line of defense
Output: This bodily defense function attacks pathogens and includes inflammatory response and phagocytosis?