Macy always thought there were only a few hair colors: blond, 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

Pigment.

Explanation: Our hair color is determined by two types of pigment, Eumelanins, and Pheomelanins. Which together produces all the natural hair colors we see every day with other people.

The pigmentation of hairs is composed by different levels of eumelanin and pheomelanin. These pigments combined compose all the colours of hair. The more quantity of eumelanin the darker the hair is. Also, the level of the composition can vary over time, causing changes on the colour of the hair.  

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

the answer is   c.) 1575 j.

explanation: