Taconite is a low-grade iron ore that is found around lake superior. the iron-bearing rock is found interlaced with quartz, chert and other minerals. the iron is separated out of the taconite using magnets so that it can be processed to for use in the production of steel in nearby states. what statement does not represent a concern by the department of natural resources about the use of taconite as a source of iron. a) the process to separate iron from taconite requires transportation by large vehicles over public roads. b) the separation of taconite involves chemicals that may lead to air and water and pollution. c) the area where taconite is mined is characterized by wetlands and streams. d) taconite is a non-renewable resource.

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

What are the characteristics of living things

Which if the following best describes why invertebrates isn’t considered a scientifically valid word when classifying animals