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

Input: Consider Input: Although they differ vastly in hardness, pencil lead and diamonds both contain carbon.

Output: Although they differ vastly in hardness, pencil lead and diamonds both contain what element?


Input: Consider Input: Antibodies recognize and combine with harmful materials, including both toxic chemicals and invasive microorganisms.

Output: Which proteins recognize and combine with harmful materials, including both toxic chemicals and invasive microorganisms?


Input: Consider Input: Through negative pressure does sap get to the tops of tall trees.


Output: How does sap get to the tops of tall trees?