The "feathering" characteristic of the gills in the crayfish is important because A. the "tips" of the feathers are able to attach oxygen molecules

B. the feathering increases the surface area through which oxygen can diffuse

C. the carapace's rough surface shreds the tissue over time, which allows oxygen to diffuse more efficiently over time.

D. the thinner the gill tissue is, the easier oxygen can diffuse into the blood.

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

Number and variety of living organisms includes genetic, species, and ecological types

How is transcription similar to translation in terms of base pairing?