Enzymes are primarily composed of proteins, which are large molecules made up of chains of amino acids. These amino acids are themselves built from the following elements:

* Carbon (C)

* Hydrogen (H)

* Oxygen (O)

* Nitrogen (N)

Some enzymes also contain cofactors, which are non-protein components that are essential for their activity. These cofactors can be:

* Metal ions: Such as iron (Fe), zinc (Zn), magnesium (Mg), or copper (Cu).

* Organic molecules: Such as vitamins or coenzymes.

Therefore, the chemical elements present in enzymes include:

* Carbon (C)

* Hydrogen (H)

* Oxygen (O)

* Nitrogen (N)

* And potentially other elements like:

* Iron (Fe)

* Zinc (Zn)

* Magnesium (Mg)

* Copper (Cu)

* Phosphorus (P)

* Sulfur (S)

* Other elements depending on the specific cofactors involved.