Cigarette smoking by pregnant women can adversely influence prenatal development, birth and postnatal development. list at least 3 potential prenatal, birth or postnatal development problems that could occur.

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