TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: A(n) gastropods is noted for having its eyes at the tips of stalks or tentacles that emerge from its head.

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

PROBLEM: It takes about one year for earth to orbit the sun.

SOLUTION: Which of these takes about one year to complete?

PROBLEM: One of the main features all vetebrates have in common is a backbone.

SOLUTION:
One of the main features all vetebrates have in common is what?