Whose experiments demonstrated that, given the conditions on the primitive earth, biological monomers could arise spontaneously?

What are the two main phases of a cell cycle

Plants consume most of their carbon from a. the soil b. the water c. the roots d. the air

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.