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: Natural selection works by selecting for alleles that confer beneficial traits or behaviors, while selecting against those for deleterious qualities. Question: What works by selecting for alleles that confer beneficial traits or behaviors, while selecting against those for deleterious qualities?
natural selection

Sentence: Lakes do craters and rifts become when they fill with water. Question: What do craters and rifts become when they fill with water?
lakes

Sentence: Chlorine is a nonmetal and gains one electron in becoming a anion. Question: Chlorine is a nonmetal and gains one electron in becoming a what?

anion