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Which statement best describes our current understanding of the relationship between CO2 levels and photosynthetic activity?Select one:a. Increasing CO2 levels will result in a sustained increase in photosynthetic activity in both herbaceous plants and forest trees.b. Increasing CO2 levels will result in a sustained decrease in photosynthetic activity in both herbaceous plants and forest trees.c. Increases in photosynthesis rates due to increases in CO2 levels are likely to be short-lived for some herbaceous plants, but may be more sustained for forest trees.d. Increases in photosynthesis rates due to increases in CO2 levels are likely to be short-lived for forest trees, but may be more sustained for some herbaceous plants.

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