Ascientific study looked at the effect of tanning beds on dna damage. the scientists took skin cells and exposed them to uv radiation (the type used in indoor tanning beds) for different lengths of time: some for 1 minute, some for 5 minutes, some for 15 minutes, and some for 30 minutes. they then looked for signs of dna damage and compared the results to cells that had never been exposed to uv light. what is the independent variable in this experiment

Heredity has an impact on personal health, but environmental factors are important as well. select the best answer from the choices provided

List two limitations of natural selection

How is ribosomal rna useful as a molecular clock? a. a large portion of the dna ring is not vital to structure or function, allowing it to accumulate neutral mutations. b. its rate of mutation increases over time as organisms continue to evolve and differentiate from each other. c. a slow mutation rate makes it useful for determining evolutionary relationships between ancient species. d. it is only found in select organisms, making it easier to compare relationships between species that have it.