Input: Answer this question:
What is the main function of the circulatory system?
Answer: transport materials
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Food webs show feeding relationships among different types of organisms. Those organisms each have a specific niche. Which of the following best describes a function of decomposers in food webs?
Answer: to recycle nutrients into soil
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Which energy source is considered nonrenewable?
Answer: oil
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Mammals must eliminate waste products that their bodies produce. Which organ helps mammals eliminate bodily waste?
Answer:
kidney