Final answer:
Net primary productivity is the energy available to primary consumers after meeting the producers' needs. It varies depending on the ecosystem, with differences between deserts and rainforests.
Explanation:
Net primary productivity is the energy that remains in the producers after accounting for the metabolic needs of the producers and heat loss. This remaining energy is then available to the primary consumers at the next trophic level. For example, in a desert, net primary productivity can be around 500 kcal/m²/yr, while in a tropical rainforest, it can reach up to 15,000 kcal/m²/yr.
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