Macy always thought there was only a few hair colors blonde, brown, and black however, when she actually began looking around she saw varying shades of these hair colors. what is a possible reason for so many different hair colors

The most appropriate explanation would be the presence of two types of melanin in hairs.

In human hairs, two types of melanin are present: eumelanin and pheomelanin.

Eumelanin determines the darkness of the hairs, that is, it would determine if the hairs of a person would be black or brown.

Pheomelanin is responsible for orange or red colors of the hairs. In addition, on breaking down, it provides the hairs with colors like red, orange, yellow and white (complete breakdown of pheomelanin).

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products

where in your body is there an enzyme that does function at a high or low ph? what is the name of that enzyme and its function?