Early geologists were only able to place rocks in their proper order of formation based on their layering. this is called a) relative dating. b) radiometric dating. c) principle of faunal succession. d) principle of original horizontality.

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.