In our natural selection simulation with mice living on a lava flow out in the desert. The mice were originally shown to all be brown but then other colors such as balck fur showed up. These different colored furs most likely came from.

Aresearcher created three groups based on participants bmi: normal weight, overweight and obese. the hypothesis being tested is that the three groups differ in the mean number of artificially sweetened drinks consumed weekly. which statistical test might the researcher use, assuming a reasonably normal distribution of values.