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

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

Example Input: During the first year after birth, a baby called a(n) infant.
Example Output: During the first year after birth, what is a baby called?

Example Input: The position characteristic of motion could change without changing the velocity of an object.
Example Output:
Which characteristic of motion could change without changing the velocity of an object?