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: 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: Boron only occurs naturally in compounds with oxygen element. Question: Boron only occurs naturally in compounds with what element?

SOLUTION: oxygen

PROBLEM: Sentence: Negative growth rate results when birth rates fall even lower than death rates. Question: What results when birth rates fall even lower than death rates?

SOLUTION:
negative growth rate