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The largest mass of living material on Earth primarily comes from phytoplankton in the oceans. These microscopic plants form the base of the marine food chain and are responsible for a significant portion of the planet's photosynthesis, contributing to around half of the oxygen produced. Additionally, terrestrial ecosystems, particularly forests like the Amazon rainforest, also contribute substantial biomass, but the sheer volume of phytoplankton makes them the largest source overall.

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5d ago

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