What is the difference between artificial and natural selection?

The first amino acid of a new polypeptide chain is

Sarah and john are having a discussion on genetic diversity. sarah believes that it happen over a long period of time. john it happens immediately. who is correct? a. sarah is correct because genetic diversity occurs over a long period of time. b. john is correct because genetic diversity occurs immediately. c. both are correct because genetic variation can occur or long period of time. d. neither are correct because genetic diversity occurs over any period of time

"your temperature analysis reveals a pattern with coldest temperatures located to the portion of the map."