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: Potential energy is stored in an object because of its position or shape. Question: What type of energy is stored in an object because of its position or shape?

SOLUTION: potential

PROBLEM: Sentence: Planting new trees where old ones were cut down of these human activities in a forest has a positive effect on the ecosystem. Question: Which of these human activities in a forest has a positive effect on the ecosystem?

SOLUTION:
Planting new trees where old ones were cut down