Which of these can be concluded from the figure below? A) In some years of the study the mean poison ivy biomass decreased to the level it was at the beginning of the study. B) There were more elevated CO₂ plots than control plots. C) Not all of the increase in mean poison ivy biomass can be attributed to the CO₂ that the researcher added. D) Poison ivy in the experimental plots was more toxic than that in the control plots.

Question

Quizplus · Accepted Answer

The figure shows the increase in mean poison ivy biomass over time for both control and elevated CO2 plots. The data suggests that the increase in mean poison ivy biomass cannot be entirely attributed to the added CO2 as there is a similar increase in the control plots. Therefore, option C is the best choice. Option A is incorrect because the figure does not show any decrease in mean poison ivy biomass over time. Option B is incorrect because the figure does not indicate the number of elevated CO2 plots. Option D is incorrect because there is no mention of toxicity in the figure or the accompanying text.

Which of These Can Be Concluded from the Figure Below