question: Given the fact "acid rain has a negative impact on water quality", what is the answer to "What is the most likely to be an effect of acid rain on an aquatic environment?"

answer: decrease in plant life

question: Given the fact "biofuel is used to produce electricity by burning", what is the answer to "Materials like ethanol are used to produce electricity by _____."

answer: burning

question: Given the fact "birds are a vehicle for spreading the seeds of a plant", what is the answer to "Seeds from a prickle bush can be moved across a continent if"

answer: gulls help

question: Given the fact "a simple machine requires mechanical energy to function", what is the answer to "What provides the energy to open a doorknob?"

answer:
you