question: What sentence would provide a factual answer to this question: "What enters the eye through the pupil?"

answer: light enters the eye through the pupil

question: What sentence would provide a factual answer to this question: "During a prolonged shortage of water, a tree's ability to add extra tissue and grow thick rings is slowed and the tree produces"

answer: as the amount of available water decreases , tree-growth rings will become narrower

question: What sentence would provide a factual answer to this question: "What can melting glaciers deposit?"

answer:
sometimes piles of rock are formed by melting glaciers depositing rocks