Carbon forms the backbone of every major type of biological molecule, including carbohydrates, fats, proteins, and nucleic acids. how does carbon’s high valence relate to its ability to form these large and complex biomolecules?

Carbon has four electrons in its outermost shell, with these it forms covalent bond with other elements by sharing electrons with them.
The elements that made up the biological molecules react easily with carbon, giving rise to different types of macro molecules. Besides this, carbon is flexible and can conform to any shape whether linear, coiled, ring or ball form. 

Carbon’s high valence relate to its ability to be able to form the biomolecules because carbon is flexible and can therefore be able to conform to different shapes.

In the outermost shell of carbon, there are four electrons which are useful in forming covalent bond with other elements.The atoms of carbon are the backbone of vital molecules that we have in our body including sugars, fats, DNA etc. The elements that are contained in the biological molecules easily react with carbon, which brings about different forms of macro molecules.

In conclusion, the flexibility of carbon plays a vital role in the formation of complex biomolecules.

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Wow that a lot of text for my tiny so i no wanna answer

Not a  mixture of two common elements that can be separated by physical means.