What is a system of tubes that processes and transports protiens in the cell ?

Air pollution is only caused by human activity, select the best answer from the choices provided ot of true or false

Why should the united state be concerned about air pollution in china?

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.