4. Fast breeder reactors are seldom used anymore because of safety concerns, as they have a higher potential for explosions. But this explosion hazard does not come from the nuclear fission reaction.
o What does it come from? Explain your answer in just one or two sentences.

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