In this experiment, the was intentionally manipulated. It is the independent variable.
The dependent variables that were measured were the

Match the types of competition to their descriptions

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?

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.