Which of these is the foundation for relative dating?
a. earth is very old.
b. deeper rock strata are older.
c. radioisotopes decay at a constant rate.
d. organisms can be closely related to each other.

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.

Explain how the number of similarities between the embryos from early stage to late stage is used as evidence of a common ancestry

Archaebacteria use for movement. celia flagella pili cell walls