question: What sentence would provide a factual answer to this question: "When the scientist finally completed his new invention he thanked his"

answer: scientists make observations

question: What sentence would provide a factual answer to this question: "Switches can be used to cease electronic energy flow, such as when"

answer: a switch is used to stop the flow of current in an electrical circuit

question: What sentence would provide a factual answer to this question: "Mammals can breathe thanks to"

answer:
plants are a source of oxygen through photosynthesis