I'm not quite sure what you mean by which sphere, but I found that the most abundant gas on earth is nitrogen at 78%. Hope this helps
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I suppose it would be the seed.
C. Decreased death rate is the answer
The point on earth's surface directly above an earthquakes focus (hypocenter) is called the epicenter.
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Carbon Cycle: the series of processes by which carbon compounds are interconverted in the environment, involving the incorporation of carbon dioxide into living tissue by photosynthesis and its return to the atmosphere through respiration, the decay of dead organisms, and the burning of fossil fuels.
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