Imagine the scenario. All of the rocks used for shelter by certain reptiles are removed from a desert ecosystem. How will the removal of the rocks affect the reptiles?

Can someone i have no idea of how to do this.

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.

The earth formed roughly 4.5 billion years ago, yet evidence of life dates back to about 3.5 billion years ago. which one is not a possible hypothesis of how life on earth arose?