The control center of a cell is the

How does the author's purpose in this passage differ from an author writing about her personal struggle living with asthma?

The energy available as a result of the motion of a body is called energy. -potential -gravitational -kinetic -chemical

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.