The evolutionary history of an organism can be determined by using the organism's

Dna or genes

I know its somthing else but i cant get my finger on it

answer; i believe that the correct answer is (light);

what have scientists found to be the most efficient and effective way to insert new sequences into an individual? a-scientists have created genetically altered foods that release dna during digestion. b-scientists use viruses to insert specific gene sequences. c-scientists irradiate genes so that they can be absorbed through the skin.