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How is the carbon cycle related to global warming ?

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above

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.