The Amazon rainforest, along with the central African region rainforest (in addition to heavily forested areas in other parts of the world). After all, plants take in CO2 and give off oxygen.
Ocean Based Phytoplankton
Oxygen gas
The molten iron and medals inside the earths core are the reasons for the earths magnetic core.
A primary tax source is the main source of revenue for a government. In most cases, the main source is from income tax and levy of goods and services.
Primary Waves(P-Waves)
Nitrogen and Oxygen
sun
Plants
Sun
Plants
Nitrogen and oxygen,
Oceans
nitrogen and oxygen
sunny D
Plants
glucose and oxygen
Sunlight.
It is a primary source.