Molly's natural hair color is brown but she has had it dyed blonde. molly changed her genotype phenotype chromosomes genetic heritage

The correct answer is - phenotype.

The phenotype represents the composition of an organism's characteristics and traits that can be observed (the physical ones), such as the physiological and biochemical properties and traits, behavior, development, morphology...

In this case we have an artificial change of the physical appearance, when the natural color of the individual's hair is changed, thus changing its physiological property/trait, which falls into the category of phenotype change.

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

gold i'm pretty sure i might be wrong