TASK DEFINITION: In this task, you are given a sentence and a question, you would be asked to create the answer which is contained in the sentence provided.
PROBLEM: Sentence: Cells come from preexisting cells. Question: Where do cells come from?

SOLUTION: preexisting cells

PROBLEM: Sentence: Substances enter any plant or animal cell by passing through cell membrane of the following structures. Question: Substances enter any plant or animal cell by passing through which of the following structures?

SOLUTION: cell membrane

PROBLEM: Sentence: Turbulent atmosphere does neptune's appearance change. Question: Why does neptune's appearance change?

SOLUTION:
turbulent atmosphere