What is a drug found in tobacco that speeds up heartbeat? * 5 points?

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

Most animal cells membranes have proteins that pump ions out of the cell and potassium ions into the cell

Construct at least two possible hypotheses for the student’s experiment.