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

Example Input: Passage: The two materials do have at least one thing in common. The atoms in the materials are held together by covalent bonds. These bonds consist of electrons shared between two or more atoms. Unlike ionic bonds, where electrons are either lost or gained by an atom to form charged ions, electrons in covalent compounds are shared between the two atoms, giving rise to properties that are quite different from those seen in ionic materials. Answer: ionic bonds
Example Output: Electrons in covalent compounds are shared between the two atoms, unlike the case in what type of bonds?

Example Input: Passage: Physics is the study of energy, matter, and their interactions. It is concerned with matter and energy at all levelsfrom the most fundamental particles of matter to the entire universe. Answer: physics
Example Output: Which branch of science is the study of energy, matter, and their interactions?

Example Input: Passage: Lycophytes follow the pattern of alternation of generations seen in the bryophytes, except that the sporophyte is the major stage of the lifecycle. The gametophytes do not depend on the sporophyte for nutrients. Some gametophytes develop underground and form mycorrhizal associations with fungi. In club mosses, the sporophyte gives rise to sporophylls arranged in strobili, cone-like structures that give the class its name. Lycophytes can be homosporous or heterosporous. Answer: fungi
Example Output:
Some gametophytes develop underground and form mycorrhizal associations with what?