Maximum oxygen comes from

A. Phytoplankton

B. Grasslands

C. Forests

D. Herbs and shrubs

Answer: Option A

Solution(By Examveda Team)

Maximum oxygen comes from Phytoplankton.
50% of the oxygen in our atmosphere has been produced by phytoplankton. Like plants and trees on land, phytoplankton gives us a lot more than food.
One type of phytoplankton, Prochlorococcus, releases countless tons of oxygen into the atmosphere.