Through a careful process of Selective breeding, dog breeders mixed different dogs with different physical traits to create new forms. Darwin was intrigued by what he was seeing breeders could do with domestic dogs. They could select forindividual such as size or shape, and they could change the look of their breed​

Agriculture is changing the environment. with increased populations, there is a greater demand for food. which of the following is not an impact of farming? a) pesticide and fertilizer pollution b) sediment transport and deposition downstream c) increased water supply and flooding d) desertification and deforestation