PLEASE HURRY Which phrase describes the relative age of a rock? uses the law of superposition to determine which rock is older or younger can determine the age based on location of a rock within the same layer requires only one rock to determine the age can provide the exact age of a rock

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