Speciation . occurs at such a slow pace that no one has ever observed the emergence of new species can involve changes to a single gene occurs only by the accumulation of small genetic changes over vast expanses of time must begin with the geographic isolation of a small, frontier population

Over the past 60 years, many amphibian species have experienced significant population declines and some species have become extinct. scientists suspected that local human activities such as the destruction of wetlands, regional pollution, and deforestation were the main reasons for these losses. however, research over the past 20 years reveals significant amphibian population declines in protected areas of the world, such as nature preserves and parks. these global declines suggest widespread problems including increased ultraviolet radiation, acid rain, and disease. in switzerland, for example, 14 of the 20 native amphibian species are threatened with extinction. chytridiomycosis is a fungal disease first identified in 1998 as a cause of massive amphibian deaths. in some severely impacted populations, a few individuals have survived, perhaps because of some natural resistance. if these resistant individuals continue to survive and prosper, new resistant populations might emerge. this would be an example of the founder effect artificial selection genetic drift natural selection sexual selection

Which of the organisms listed below performs nitrogen fixation? a. legumes b. plants c. bacteria d. fungi

Explain what is meant by a river’s load, and describe how the load is carried.