Fill in the word that completes each sentence.
In the mitochondrion, small molecules combine with to produce and carbon dioxide.
This process releases a large amount of .

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.