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

Input: Consider Input: Solid form do alkali metals take at room temperature.

Output: What form do alkali metals take at room temperature?


Input: Consider Input: The long, threadlike extensions of the nerve cell help transmit nerve impulses.

Output: Which part of the nerve cell helps transmit nerve impulses?


Input: Consider Input: The passenger piegon once most common bird in north america became extinct in the 1800s.
Output: What once most common bird in north america became extinct in the 1800s?