a biologist was studying two indigenous groups of people from different areas of the world. the first population was from equatorial africa. the second population was from northern europe. the biologist was studying a gene that affects skin color. the biologist examined the gene in 100 people from each population. she kept track of how many different forms ( or alleles ) of the gene she found in each population. the results are in the graph in figure

Scientists are conducting a study on the effectiveness of a new drug on memory loss. they are giving some of the test subjects the new drug to find out if it improves their long-term memory. which are possible limitations of this study? check all that apply. a) test subjects may want to participate in additional experiments. b) test subjects may think they should be paid more. c) test subjects may get bored and want to quit early. d) test subjects may have to travel during the experiment. e) test subjects may have full-time jobs. this is multiple choice. you for the !