Net primary production is the rate at which new biomass is generated mainly due to photosynthesis Mu...........

Geography World - Soil and Vegetation

Net primary production is the rate at which new biomass is generated, mainly due to photosynthesis. Multiplied by total area, it yields total biomass production in a year. Which of the following ecosystems generate highest total biomass annually?

Oceans

Rainforests

Cultivated Lands

Coral Reefs

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Explanation:

2nd option is correct.
Rainforests are forests characterized by high rainfall, with annual rainfall in the case of tropical rainforests between 250 and 450 centimetres (98 and 177 in), and definitions varying by region for temperate rainforests.