C <span>less contaminants would flow into the drainage basin</span>
Answer:
Mitochondria and chloroplasts
Explanation:
Mitochondria and chloroplasts each have their own DNA due to at one point being prokaryotes that fused with other prokaryotes.
Drugs and other chemicals are examples of how environmental factors affect gene expression. These drugs can either 'activate' or 'inhibit' the expression of genes that you have. For example, taking drugs while being pregnant affects the genetic makeup of the baby inside you.