Paper chromatography is a technique used to separate molecules based upon their size and solubility in a particular solvent. if pigments from a particular species of plant are extracted and subjected to paper chromatography, which of the following results is most likely? a) paper chromatography would separate the pigments into several bands that appear green or yellow/orange. b) paper chromatography would separate the pigments into two bands, one that appears blue and one that appears red. c) paper chromatography would produce a single band of pigment that is characteristic of that particular plant. d) paper chromatography would separate the pigments into two bands that appear green.

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

The negative impacts of nonnative species generally outweigh the positive impacts

Why did adult crab numbers decline in he ecosystem, even though sea stars were still available?