The overall rate at which humans are producing carbon dioxide is ________.
A) increasing
B) decreasing
C) some years increasing and other years decreasing
D) remaining about the same
Question 2
What determines the direction of heat flow?
A) Heat always flows from a lower-temperature substance into a higher-temperature substance.
B) Heat always flows from a higher-temperature substance into a lower-temperature substance.
C) Heat flow direction depends upon the density of the substances involved.
D) The direction of heat flow is not predictable in any given process.
On average, the ratio of carbon to nitrogen is much higher in terrestrial plants than in other major
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