How can environmental factors affect inheritance

Similarly,drugs,chemicals,temperature and light are among the external environmental factors that can determine Wich genes are turned on and off,thereby influencing the way an organism develops and function.

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme