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(a) Eating food does not induce genetic change. Its not how it works. You MIGHT have been able to build an argument based on selection of certain traits, for another thing. But cooked food? You do get not all of humanity cooks its food, or cooks its food the same way right? Yet we are a species that is very genetically similar.
Gene changes that may lead to lung cancer Scientists know how some of the risk factors for lung cancer can cause certain changes in the DNA of lung cells. These changes can lead to abnormal cell growth and, sometimes, cancer. DNA is the chemical in our cells that makes up our genes, which control how our cells function. We usually look like our parents because they are the source of our DNA. But DNA also can influence our risk for developing certain diseases, including some kinds of cancer.