Adrug company tests a new drug and finds that in addition to curing itchy feet, that the standard dosage of 400 mg, has common side effects including ringing ears, dizziness, upset stomach, hallucinations, and delusions. if a clinical trial was done, and the drug was tested on 100 people, all but would be dependent variables.

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.