Biological factors that affect an organism's niche include all of the following except
A. competition for resources
B. food needs
C. predators
D. sunlight

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.