Fill in the blank. 1. Due to the thick and viscous material in the asthenosphere, the liquid is called
2.
is reached when areas of the lithosphere stop rising.
3. A change in density occurs as a result of compression.
Respond to the following based on your reading.
4. What happens in the theory of isostasy?

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.