What is the experiment called in which all the features of each experimental group are exactly the same, except for the independent variable?

i think it's called a controlled group

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.

i think that you are smart and you should fit for it out