in photosythensis, a plant produces oxygen from CO2 for humans and other animals
Massive Trees.
Algae
China is the worlds largest wheat producing country in the world.
china
Most of the worlds oxygen is produced by Trees.
India
china is the largest producer of wheat
Bacteria
Phytoplankton is what gives us as humans oxygen. Without it, we can`t live.
if you mean largest percentage then the answer would be elephant and lions/cheetahs
It's not really a company, but instead, it's a country. Brazil is the largest coffee producing thing/place/country.
Worlds largest animal: Blue Whale
worlds largest producer of nickel
USA has the worlds largest rail network.