What is the purpose of using multiple control groups in an experiment? To ensure that you have all of the materials you need to do your
experiment
To provide a reason for asking your research question
To help you conclude that no uncontrolled factors significantly
influenced your results
To follow your curiosity wherever it might lead

Humans are believed to have evolved in coastal regions in east africa. the region had an abundant supply of fish for early humanoids to eat. when scientists analyze the fads gene they see an interesting pattern. people whose families have lived in this area of east africa for generation show a high level of diversity in alleles for the fads gene. conversely, people whose families had migrated inland a moderate distance from sources of fish showed a much lower diversity for fads gene alleles. additionally, the fads alleles found in people whose family has lived inland for generation are almost all gene alleles which produce fads proteins with a high level of function and activity. how do anthropologists explain this?