When people used stone tools,
The in-between period of time when the first man appeared and when man developed a writing system. Or the period of time before man became literate.
I think it's A.
phenotype frequency is the number of individuals in a population that have a specific observable trait or phenotype
The Psychedelic Experience, served as a guide.
Helicase, DNA polymerase, Ligase and Primase. These are the ones we learned I don't know if there are more.
