What additional piece of information must Jenny have in order to determine the age of the zircon? A. the thickness of sedimentary rock layers found near the zircon
B. the ages of any fossils found near her sample of zircon
C. the decay rates of radioactive uranium and lead

Dna, in the nucleus carries the genetic code for making proteins in ribosomes. in the diagram, b, represents the proteins produced. dna cannot leave the nucleus to carry the genetic information to the ribosome where proteins are produced. how does the genetic code get from the nucleus to the ribosome? what does a represent? now