TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Phototaxis is the term for movement toward light.

SOLUTION: What is the term for movement toward light?

PROBLEM: All life is built around the element carbon.

SOLUTION: What element is all life built around?

PROBLEM: By color is the most common way to classify stars.

SOLUTION:
What is the most common way to classify stars?