What basis do biologists use to place living things in different groups

Which beat describes the brain stem

Drag the tiles to the correct boxes to complete the pairs. match the nitrogenous base of dna with its complement.

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.