∴∴Viruses are hard to classify as living or non-living. Give reason

The shift of a vehicle's weight around its center of gravity is known as

In this case, the statement that people who exercise for an hour may have lower cholesterol levels is .

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.