question: Given the fact "a plant 's roots slowly break down rocks as the roots grow", what is the answer to "What is the most likely cause of split rocks on a mountain slope?"

answer: pine tree roots

question: Given the fact "the Earth contains many ecosystems", what is the answer to "Which of the following would be excluded from a list of ecosystems?"

answer: snow

question: Given the fact "processes sometimes produce waste products", what is the answer to "Eating and digesting a large meal is guaranteed to produce"

answer: fecal matter

question: Given the fact "as mileage per galon of gasoline increases , the amount of gasoline used will decrease", what is the answer to "when fuel efficiency increases, gasoline use in cars will"

answer:
decrease