The presence of which element would indicate that a star is going through a high-mass star life cycle as opposed to a low-mass star life cycle?

Which organelles are involved in energy conversion

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.

With the word calcite wich completes the analogy mineral, erosion, marble, or aragonite