You are conducting an experiment to evaluate how the number of hours spent exercising each week affects blood pressure. Which of the following variables would be controlled in this experiment?

Which pair of chromosomes determines sex in humans? a.15th b.1st c.23rd

How does the process of meiosis ensure that each generation of offspring has the same number of chromosomes as the generation before

Plz need in 5 minutes which of the following statements about single-member districts is true? a. a candidate who gets the least number of votes can be elected. b. a candidate who gets the second-highest number of votes can be elected. c. a candidate who gets the greatest number of votes, whether it is a majority or not, can be elected. d. a candidate who belongs to a minor political party has a good chance of being elected.