Answer: The drug abuse is influenced by the environment and exerts influence on the gene expressions.
Explanation:
The genetic make up of the person is decides, which genes will be expressed and develop a trait in an individual. But this genetic expression can be influenced by the environmental factors like food, exposure to sunlight, and others. This study which relate environment with the genetic make up is called epigenetics. No person is drug addict by birth but the consumption of drug can influence the genetic make up and traits in a abuser. So here, the environment is influencing the genetic basis of a abuser.
The correct answer is B. beaks, finches
Explanation:
One of the main elements Darwin used to write "The Theory of Evolution by Natural Selection" was his observation of finches on the Galapagos island. Charles Darwin visited Galapagos during the 1830s and in there he observed multiple species of finches that differ in the shape of their beaks. This caught Darwin's attention who determined the shape of the beak varied according to the diet the species had. For Darwin, this shown all the finches derived from the same ancestor and their beaks and other features were the results of natural selection and evolution. Thus, Darwin wrote his theory by noting the differences in the beaks of closely related finches.