Cell differentiation is most directly regulated by

What is a codon and where is it found

Describe the response the kidneys have to dehydration and excessive water intake. what happens to the concentration of urine in each case ?

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.