R Robert L New member Jan 11, 2010 #1 at the beginning of what period in the earth’s history did there appear to be a dramatic increase in the number and diversity of living forms? What evidence is there of life on earth before the beginning of that period?
at the beginning of what period in the earth’s history did there appear to be a dramatic increase in the number and diversity of living forms? What evidence is there of life on earth before the beginning of that period?
