In several studies of plant responses to elevated CO2 concentrations in the atmosphere,scientists often found that the stimulation of growth gradually diminished because
A) more photorespiration occurred.
B) C3 plants were replaced with C4 plants.
C) the soil did not contain sufficient nitrogen and other nutrients to support the enhanced growth.
D) the plants could not store the extra biomass.
E) weedy plants took over the experimental plots.
Correct Answer:
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