question: What sentence would provide a factual answer to this question: "Large metropolises can have a huge bedbug"

answer: an ecosystem contains large numbers of living organisms in a particular place

question: What sentence would provide a factual answer to this question: "To prevent electric shock"

answer: brick is an electrical insulator

question: What sentence would provide a factual answer to this question: "Which would you use a graduated cylinder for?"

answer:
a graduated cylinder is used to measure volume of an object