question: Given the fact "down feathers are a thermal energy insulator", what is the answer to "The purpose of bird feathers, especially down, is to"

answer: retain body temps

question: Given the fact "planets orbit stars", what is the answer to "celestial bodies are known to"

answer: circle balls of hydrogen

question: Given the fact "An example of replacing a natural resource is planting new trees where a forest once stood", what is the answer to "An example of replacing a natural resource like copper might be"

answer: recovering ores

question: Given the fact "eyes are used for seeing by animals by sensing light", what is the answer to "Which can view an ocean?"

answer:
dogs