question: What sentence would provide a factual answer to this question: "A battery that is placed in vinegar will cause the vinegar to"

answer: if an object undergoes chemical change then that object will have new chemical properties

question: What sentence would provide a factual answer to this question: "Birds go south to look for"

answer: An example of migration is birds flying south in the winter

question: What sentence would provide a factual answer to this question: "An example of a fossil is the bones of what kind of animal?"

answer:
An example of a fossil is the bones of an extinct animal