C I’m pretty sure sorry if I’m wrong
The follicle because:The hair color is determined by a pigment, the follicle, produced by specialized cells known as melanocytes. These melanocytes produce two kinds of melanin: eumelanin (which more concentrated gives darker hair) and pheomelanin (a reddish color pigment).
is the process of physical changes through which a child's body matures into an adult body capable of sexual reproduction.
pandemic is used to describe a disease that affects the whole country or the entire world. while epidemic is used to describe any problem that was grown out of control.