Circle image made of 1 or more cell

Which of the following explains why a tree is often used as a model to represent the principle of common descent

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.

What is used as a template during replication? a- mrna b- trna c- rrna d- dna