Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Input: Consider Input: Mesoderm type of cell layer do flatworms have.

Output: What type of cell layer do flatworms have?


Input: Consider Input: In the tropics tradewinds are the prevailing winds called.

Output: In the tropics what are the prevailing winds called?


Input: Consider Input: A combination reaction is a reaction in which two or more substances combine to form a single new substance.
Output: What kind of reaction is a reaction in which two or more substances combine to form a single new substance?