question: What sentence would provide a factual answer to this question: "What is an example of combining"

answer: An example of combining two substances is pouring one substance into the other substance

question: What sentence would provide a factual answer to this question: "Plants use the water for their"

answer: sugars are transported from the leaves to the roots of a plant

question: What sentence would provide a factual answer to this question: "Our planet has multiple"

answer:
the Earth contains many ecosystems