To compare the ages of rock layers to each other, scientists can use an easily identifiable and widely distributed fossil called
a carbon fossil
a radioactive fossil
an index fossil
a sedimentary fossil

lesson summarykaryotypes a genome is the full set of all the genetic information that an organism carries in its dna. chromosomes arebundles of dna and protein found in the nucleus of a eukaryotic cell.

where in your body is there an enzyme that does function at a high or low ph? what is the name of that enzyme and its function?