All synthetic materials ultimately come from

Factories-i.e. created from humans

Explanation:

Synthetic materials, like polyester, nylon and acrylic, don't exist naturally but are made in factories. Synthetics are created through an industrial manufacturing process in which petroleum, a fossil fuel, is extracted from the earth and mechanically transformed into fibers for clothing.

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.