Give an example of a type of cell that generally does not divide once it has developed

When analyzing tree rings, what do scientists assume a thin ring indicates?

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

When are the centromeres broken in meiosis?