Multiple Choice
Consider the figure below. The bars show changes in primary productivity with and without endomychorrhizal associations for a group of plants that diverged early in the history of terrestrial plants. 
Which of the following statements supports the data shown in the figure?
A) Endomycorrhizal associations do not increase primary productivity in these plants.
B) Endomycorrhizal associations increase primary productivity in these plants.
C) Endomycorrhizal associations only help these plants at high CO2 concentrations.
D) Endomycorrhizal associations only help these plants at low CO2 concentrations.
Correct Answer:
Verified
Correct Answer:
Verified
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