This graph gives information on greenhouse gas (ghg) emissions from generating electricity in the united states. which questions would clarify this evidence? why does producing electricity cause greenhouse gas emissions? why do power plants release hydrofluorocarbons and other f-gases? why did greenhouse gas emissions decrease between 2007 and 2009? are greenhouse gases released because of food digestion in cattle? where is the data on greenhouse gas emissions from volcanic eruptions?

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.