question: What sentence would provide a factual answer to this question: "As a pond is slowly evaporated, the food for ducks in that area"

answer: as available water in an environment decreases , the amount of available food in that environment will decrease

question: What sentence would provide a factual answer to this question: "A long time ago, the Grand Canyon was"

answer: the Grand Canyon was formed by the Colorado River flowing over long periods of time

question: What sentence would provide a factual answer to this question: "What shows that animals learn behaviors by watching their parents?"

answer:
animals learn some behaviors from watching their parents