Where does most of Earth's oxygen come from?

Question

Where does most of Earth's oxygen come from?

Answer 1

Plankton!  The ocean's plankton actually produce more oxygen than all the forests of land-trees combined.

Answer 2

Mostly Forests.

Answer 3

Russia's Rainforest!

Answer 4

The O2 (gas) comes from oxides and carbonates. The chlorophyll uses the light, CO2 and H2O to produce O2.

The phytoplankton of the oceans is the main source, but the rain forests from the Amazon and Congo rivers are very important too..

Answer 5

from the cellular respiation process that plants use...they take in Co2 and output O2 while humans take in O2 and out put Co2.........

Answer 6

Most of the Earth's oxygen comes from phytoplankton that live in the Earth's oceans. These microscopic organisms provide the majority of the Earth's photosynthesis.

Hope this helped.