A group of students is reviewing information about the salivary glands and their secretions. The students demonstrate understanding of the information when they identify which components of saliva

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.

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Which nutrient tends to cycle within a single ecosystem?