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

Input: Consider Input: Passage: When water freezes in a non-crystalline, amorphous form as frost, the water molecules are fixed in place, but not in a regular, repeating pattern. Frost and other amorphous solids are characterized by their unorganized and unpredictable structure. Because ice comes in both amorphous and crystalline forms, there are differences in the physical properties of ice such as its hardness and density. Answer: amorphous

Output: What kind of solid is characterized by an unorganized and unpredictable structure?

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: Dolphins are living organisms, so studying them is part of the life sciences. The life sciences, however, are broken down into many fields. Scientists that study dolphins and other life in the ocean are called marine biologists. Answer: marine biologists
Output: Scientists that study dolphins and other life in the ocean are called what?