Which change in a gene pool is occurring in the image below

Which type of respiration takes place when there is no oxygen present

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.

What is the difference between a meteoroid and a meteor?