which scientist proposed the idea of studying humans as groups rather than as individuals?; which factor is most likely to contribute to the evolution of a species?; which is the best example of natural selection?; which conclusion is best supported by his observations?; which descriptions of evolution are accurate? select three options.; the process of change in a population over time is called; which idea did linnaeus contribute to the theory of evolution?; which statements best describe natural selection? check all that apply.