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.

Sentence: Sexual reproduction usually occur during times of environmental stress. Question: What type of reproduction usually occur during times of environmental stress?
sexual reproduction

Sentence: Birds pair up with the same bird in mating season. Question: What do birds do in mating season?
pair up with the same bird

Sentence: Conductivity, oxidation state and physical appearance are properties that help determine whether elements are metals. Question: Conductivity, oxidation state and physical appearance are properties that help determine whether what are metals?

elements