Scientists study how radioactive isotopes in rocks, such as Carbon-14, decay to tell the age of rock.

Explain how knowing the half-life of Carbon-14 can tell scientists the absolute age of a rock sample.

Ras is a g-protein that is activated when a growth factor attaches to egfr. its activation results in the replacement of a gdp molecule with a gtp molecule, thus allowing a signal transduction pathway to be activated. considering the signal pathway illustrated on this page, what is one potential outcome of a mutation in the ras gene that leads to ras protein hyperactivity. be specific.