Chemical reactions that combine simple molecules and monomers to form complex structures are known as

Anabolism

Explanation:

Chemical reactions that combine simple molecules and monomers to form complex structures are known as ANABOLISM.

Anabolic reactions which are also called biosynthesis reaction is a type of metabolic reaction in the body that forms larger molecules through combination of smaller molecules with the use of energy in the form of ATP molecules. Example if anabolic reactions in the body includes:

- formation of polysaccharide from monosaccharides,

- formation of triglycerides from fatty acids,

- formation of nucleic acids from nucleotides and many among others. I hope this helps, thanks.

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