TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Evolution occurs by natural selection, a process whereby better-adapted members pass along their traits, according to darwin.

SOLUTION: Evolution occurs by what process whereby better-adapted members pass along their traits, according to darwin?

PROBLEM: Gastro-esophageal sphincter sphincter is located at the stomach end of the esophagus and opens to allow the bolus to enter the stomach.

SOLUTION: Which sphincter is located at the stomach end of the esophagus and opens to allow the bolus to enter the stomach?

PROBLEM: Carbohydrate contains carbon, hydrogen, and oxygen in a ratio of 1:2:1.

SOLUTION:
What contains carbon, hydrogen, and oxygen in a ratio of 1:2:1?