Did humans and dinosaurs coexist ? Explain your response

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.

Mrna decodes information from the original dna master plan to build proteins in the during the process of ribosomes.

Which of the follow describes a disadvantage secondary sources have compared to primary sources?