An action potential is: a migrating region where the electrochemical potential of a membrane undergoes reversal a flow of electrons from one cell to another an electrically charged molecule such as sodium or potassium ions a region where the electrochemical gradient of a membrane causes acetylcholine production

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