Age of fossils in the past was generally determined by radio-carbon method and other methods involving radioactive elements found in the rocks. More precise methods, which were used recently and led to the revision of the evolutionary periods for different groups of organisms, include

Options

A. Study of carbohydrates and protein in fossils.
B. Study of conditions of fossilisation
C. Electron spin resonance and fossils DNA
D. Presence of carbohyrates and protien in rocks.

Answer

C