The net primary productivity of an ecosystem is........

Environment and Ecology Concept of Ecosystems

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The net primary productivity of an ecosystem is

The gross primary productivity minus plant respiration

The primary productivity at herbivore level

The primary at consumer level

The productivity at top consumer level minus at all levels

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Explanation:

The net primary productivity of an ecosystem is the gross primary productivity minus plant respiration.
Net primary production is the rate at which all the plants in an ecosystem produce net useful chemical energy; it is equal to the difference between the rate at which the plants in an ecosystem produce useful chemical energy (GPP) and the rate at which they use some of that energy during respiration.