Please do anyone know the answer

2. given that most biochemical (other than coal) rocks react with hydrochloric acid, what does that tell you about organisms?

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.

During convection, less dense fluid rises and denser fluid sinks.