oxygen
we and the animals breath it.
Oxygen is a product of photosynthesis that is used by plants and animals for respiration.
Combustion.
plants and animals.
Oxygen is used up.
it is used in metabolic process
Oxygen partially dissolves in water. Respiratory systems of aquatic animals are adapted to get this dissolved oxygen. They have gills for respiration.
Of course! Animals are used for meat, which is good, and you need plants for oxygen and food.
Oxygen
It released into the atmosphere, if it isn't immeadiately used in respiration.
Animals breathe oxygen and eat plants.
Animals breathe in oxygen in the air.