Which of the following characteristics of living things best explains why some North American birds fly
south for the winter?
a. Living things respond to their environment.
b. Living things maintain internal balance.
c. Living things are made up of units called cells.
d. Living things are bazed on a universal genetic code.

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.