Think of it this way:
DNA inside cells store all the genetic information on a person's looks, eye colour, hair colour etc. It makes them unique. The analogy of being like books in a library basically suggests that in a library there is so much information and every book is different with different knowledge... That's basically what DNA is; millions of different information things.
Genetic variation occurs.
Mutations are not copied over and over again.
I believe the correct answer among the choices presented above is option A. The flow that correctly shows how genes are inherited is DNA→ RNA→ protein→ trait. The DNA gets transcripted into RNA which is translated to the proteins which turns into traits.
A tanned skin because if it was a cold cloudy environment she would be more fair
I think it’s B. Hunting and gathering !