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

Input: Consider Input: Passage: There are no forces of attraction or repulsion between gas particles . Attractive forces are responsible for particles of a real gas condensing together to form a liquid. It is assumed that the particles of an ideal gas have no such attractive forces. The motion of each particle is completely independent of the motion of all other particles. Answer: superscripts

Output: Which measure indicates the number of electrons in a given sublevel?

Input: Consider Input: Passage: Virtually all animals have internal digestion of food. Animals consume other organisms and may use special tissues and organs to digest them. (Other heterotrophs, such as fungi, absorb nutrients directly from the environment. ). Answer: internal

Output: What sort of digestion do animals engage in?

Input: Consider Input: Passage: The stored food in a seed is called endosperm . It nourishes the embryo until it can start making food on its own. Answer: endosperm
Output: What is the stored food in a seed called?