question: What sentence would provide a factual answer to this question: "What forms craters on planets?"

answer: usually craters on planets are formed by asteroids impacting that planet or moon 's surface

question: What sentence would provide a factual answer to this question: "A learned characteristic could be"

answer: doing chores is a learned characteristic

question: What sentence would provide a factual answer to this question: "Animals the exemplify relationship behaviors are"

answer:
An example of a reproductive behavior is salmon returning to their birthplace to lay their eggs