Can you tell from this tree whether a C at position 15 evolved before or after a T at position 15? Explain your answer.

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.

Variety of living organisms; includes genetic, species, and ecological types.

Which tool could you see a plant cell? a. a filter b. a microscope c. a microwave d. an electromagnet