The hydrostatic skeleton of the earthworm allows it to move around in its environment by .

In a cladogram' when does a group of organisms branch off

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.

About how many years does it take for one cycle of surface water to become deep water and then surface water again in the oceans? 101001,000