The first four elements are oxygen, carbon, hydrogen and nitrogen.
They form water, proteins, enzymes, etc.
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Which is the most important and abundant carbon-fixing enzyme on earth
Water vapor was the major gas produced in the secondary (post-formation) atmosphere on Earth. Oxygen was gradually maintained as an abundant gas by the action of biological organisms.
Rubisco
Cellulose. Cellulose is a polymer of glucose molecules. It is different from starch or glycogen due to the type of bond between the glucose molecules.
Phospholipids
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Cellular respiration is the cell's main way to produce abundant amount of ATP molecules, which are high in energy. Without the respiration, the cell will not have enough energy to go through its regular functions.
hydrogen
Nitrogen is a building block of aminoacids, which in turn are the building blocks of proteins, one of the most abundant molecules in living things.
D-glucose!
The most abundant chemical substance in the human body is water. There are a lot of H2O molecules throughout the human body.
Which is the most important and abundant carbon-fixing enzyme on earth
Silicates
Water vapor was the major gas produced in the secondary (post-formation) atmosphere on Earth. Oxygen was gradually maintained as an abundant gas by the action of biological organisms.
There was an abundant supply of water. Last year we had an abundant harvest of apples.
The ozone has no layers inside it. It is a single layer with abundant ozone molecules inside it.