Aclient with severe major depressive disorder is lying in bed and has not moved for 3 hours. the client will respond slowly to "yes" and "no" questions; otherwise, the client does not respond when spoken to. the clinical manifestations exhibited by the client are known as:

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.