What is the best definition of biogeographic isolation?

Categorize each term as something that is typical of a scientific theory, a scientific hypothesis, or both. makes predictions

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.

The largest unit within which gene flow can readily occur is a