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no.
I think your referring to an element, the basic unit(s) that cannot be broken down without fission.
fermentation
In human body,H2O2 is broken down intn water.Enzyme involved is catalase.
The process of breaking down food to its building blocks is called digestion. We can then absorb the products and use them in our bodies.
Weathering, erosion.
weathering
weathering
Weathering< is the process by which materials are broken down either physically or chemically, or by a combination of both.
a element can not be broken down in to smaller such materials
molecule
no unless they are ash
it is weathering
Oxygen
composting
Simple molecules are further broken down in cells in a process called catabolism.
Generally, that process is erosion.