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Succession in a forest ecosystem is characterized by changes in species diversity, biomass and net primary productivity as shown in the graph below. Identify curves a, b and c.                                  

A)  a: biomass, b: net primary productivity, c: species diversity

B)  a: species diversity, b: net primary productivity, c: biomass Herbs Shrubs Trees

C)  a: net primary productivity, b: biomass, c: species diversity

D)  a: net primary productivity, b: species diversity, c: biomass