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

Input: Consider Input: Protists are thought to be the oldest eukaryotes.

Output: What is thought to be the oldest eukaryotes?


Input: Consider Input: Opaque is the term for matter that does not let any light pass through.

Output: What is the term for matter that does not let any light pass through?


Input: Consider Input: Proteins is needed to create muscles, regulate chemical reactions, and transport oxygen.


Output: What is needed to create muscles, regulate chemical reactions, and transport oxygen?