Maximum O₂ evolution occurs from

Solution(By Examveda Team)

Maximum O₂ evolution occurs from Marine phytoplankton.
Phytoplankton is the autotrophic component of the plankton community and a key part of ocean and freshwater ecosystems.
In a balanced ecosystem, they provide food for a wide range of sea creatures. Phytoplankton, also known as microalgae, are similar to terrestrial plants in that they contain chlorophyll and require sunlight to live and grow.
They account for about half of the global photosynthetic activity and at least half of the oxygen production, despite amounting to only about 1% of the global plant biomass.