It is part of the Respiratory Cycle of most living things on Earth.
Ear wax creation
It determines the amount of dissolved oxygen that is consumed by aerobic biological microorganisms in water. It is measured by the amount of oxygen that is consumed per liter of sample during 5 days of incubation it is in milligrams.
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The biological significance of a DNA molecule is that it: 1) Controls the synthesis of proteins (as well as enzymes because they are also proteins). 2) Is responsible for carrying hereditary characteristics.
I believe it is the role for something (Substance or Being) in nature So oxygen molecules will have the biological role to supply the animal's blood with oxygen
A biological oxygen demand is another term for a biochemical oxygen demand - the amount of oxygen needed by aerobic microorganisms to decompose all the organic matter in a sample of water - used as a measure of pollution.
by utilizing oxygen for biological processes without taking any additional oxygen in
Calvin Cycle shown in link. PGAL - 1.Used to produce sugars etc.. 2.Used to regenerate the 5 carbon acceptor of CO2 (RuBP).
to musrure oxygen
yes
Photosynthesis.
Photosynthesis returns oxygen to the environment (undertaken by the biological processes of plants).