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Because the element carbon forms the backbone of the molecules that make up cells, one of the most important biogeochemical cycles to life on Earth is the carbon cycle. ... Carbon moves from living things back to the environment as all types of organisms use some of their food molecules as a source of energy.
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Answer:
C. They have a continental rise.
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Answer:
the answer is d 
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8-10 years but one has lived to 20 years.