air , what we breathe in
carbohydrates and lipids
Plants: they take in CO2 during photosynthesis and give off oxygen. The rainforests are a major help, but are being cut down at very fast rates.
Tradition. The mitochondria have been our major energy source for about a quarter of a billion years - and they are designed to oxidize hydrogen to water.
The 6 most common nonmetals in the human body are carbon, hydrogen, oxygen, nitrogen, phosphorus, and sulfur.
Water is made of two hydrogen atoms and one oxygen atom. Hydrogen and oxygen are major building blocks of life.
dumb question lol
oxygen
oxygen(O2)
Plants
Green Plants
peni
Volcanic Outgassing :D
carbohydrates and lipids
yes
Yes, oxygen is still the major source for energy conversion.
They get food by the plants and animals living under the water and they get oxygen by the oxygen dissolved in the water
No, bacteria or insects that eat plants use oxygen and the dead plants, which contain carbon, release carbon not oxygen.