1-What is speciation or the evolution of species by natural selection and how does it work? Give an example. 2-Climate change deniers have many unsubstantiated claims. Provide an unscientific denial and, in your own words, a scientific rebuttal. This is a science class but economics and ethics matter. 3-Biodiversity has many benefits; name a few while naming a few specific causes and effects of local or global extinction. Examples help. 4-Name four each of the five: fossil fuels and criteria pollutants, greenhouse gases and renewable sources.