(Figure 21.8) The figure shows results of nitrogen addition in eight sites around the United States. What do these results tell us about limiting resources at the sites? What did researchers conclude about declines in species richness?

Name: (Figure 21.8) The figure shows results of nitrogen addition in eight sites around the United States. What do these results tell us about limiting resources at the sites? What did researchers conclude about declines in species richness?
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