Which of the following best defines the carbon cycle?
a. cycling of carbon that is essential for life and climate processes
b. cycling of carbon that involves changes between the solid, liquid, and gas phases
c. cycling of carbon dioxide that is essential for life and climate processes
d. cycling of carbon dioxide that involves changes between solid, liquid, and gas phases
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Ответ:
Ответ:
More friction means it's more difficult to move things. By reducing the friction on their loading ramps, they are also reducing the work it takes to complete a job.
Explanation: