Examine the accompanying figure. Notice the amount of average net primary productivity gets smaller and smaller as you move down the list of terrestrial ecosystems and, similarly, in the list of aquatic ecosystems. What is the common factor in the terrestrial system that causes the decline? What is the common factor in the aquatic system that causes the decline there?

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The Answer of  Examine the accompanying figure. Notice the amount of average net primary productivity gets smaller and smaller as you move down the list of terrestrial ecosystems and, similarly, in the list of aquatic ecosystems. What is the common factor in the terrestrial system that causes the decline? What is the common factor in the aquatic system that causes the decline there?

Examine the Accompanying Figure