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

Ex Input:
Population is an important level of organization in ecology and the unit of microevolution.

Ex Output:
What is an important level of organization in ecology and the unit of microevolution?


Ex Input:
A(n) gastropods is noted for having its eyes at the tips of stalks or tentacles that emerge from its head.

Ex Output:
What type of creature is noted for having its eyes at the tips of stalks or tentacles that emerge from its head?


Ex Input:
Contour lines show the three-dimensional shape of land.

Ex Output:

What feature of the land do contour lines show?