If you find a rock that has a belemnite fossil in it, how old is the rock?

Environmental impacts on evolution : mastery test

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.

"your temperature analysis reveals a pattern with coldest temperatures located to the portion of the map."