question: What sentence would provide a factual answer to this question: "An animal usually weighs the most if it has eaten"

answer: as the amount of food an animal eats increases , the weight of that animal will increase

question: What sentence would provide a factual answer to this question: "Sycamores have the worlds largest"

answer: a stem is a source of support for a plant

question: What sentence would provide a factual answer to this question: "Which type of energy is the most environmentally friendly?"

answer:
solar energy is a renewable resource