Place the following organisms in order (starting at the bottom) in which they would appear after succession takes place on an island devastated by a volcano? grass moss and lichen tall hardwood trees small softwood trees shrubs

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