True or False: The density of a specific type of material never changes.

How do living things obtain phosphorus

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.

Which if the following best describes why invertebrates isn’t considered a scientifically valid word when classifying animals