Rivers start in areas of higher elevation and run towards the ocean. The river moves sediment, as well as water. When a river is dammed, it will change the sediment flow of an area. Which change of sediment would be a result of a dam being built.

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