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

Example Input: A white dog has a puppy with white fur statement is an example of an inherited trait in a living thing.
Example Output: Which statement is an example of an inherited trait in a living thing?

Example Input: A covalent network solid is a compound in which all of the atoms are connected to one another by covalent bonds.
Example Output: What is a compound in which all of the atoms are connected to one another by covalent bonds?

Example Input: 300 million years long ago did the ancestors of mammals evolve.
Example Output:
How long ago did the ancestors of mammals evolve?