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: Red-shift refers to a shift toward red in the spectrum from stars. Question: red-shift refers to a shift toward red in the spectrum from what celestial bodies?

SOLUTION: stars

PROBLEM: Sentence: Terrestrial biomes are classified by climatic factors and types of primary producers. Question: What are classified by climatic factors and types of primary producers?

SOLUTION: terrestrial biomes

PROBLEM: Sentence: The first living cells may have evolved around 4 billion years ago. Question: The first living cells may have evolved around how long ago?

SOLUTION:
4 billion years