question: What sentence would provide a factual answer to this question: "A scale is used to measure what?"

answer: a scale is used for measuring weight

question: What sentence would provide a factual answer to this question: "Sea horses require"

answer: the sun is the source of energy for life on Earth

question: What sentence would provide a factual answer to this question: "Something that shows that the earth changes is"

answer:
An example of a change in the Earth is an ocean becoming a wooded area