Isotope are elements which have the same "number of protons" but differ in the "number of neutrons". Having trouble with your homework? The collision created huge quantities of dust that blocked out the sun for years, causing plants to die, also cutting off many oxygen sources, which are needed for survival. See next answers. Use Figure to determine the age of the sample if the half-life of the material is 60 million years.
What are fossils and how determine age of
Sign up. Comments Report. Figure shows the times of appearance and relative abundance of major groups of. Having trouble with your homework? Secondary School Biology 10 points.