Which of the following is an example of qualitative observation?
joseph is observing the color difference in the reaction mixture of each of the test samples to see what types of proteins are present in them.
joseph is measuring the color of the reaction mixture colorimetrically to see the concentration of proteins in the sample.
joseph is observing the color of the reaction mixture to see whether proteins are present in the given solution.

Read the following scenario to answer the following question. 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. when most populations of a wide-ranging amphibian species are lost and the few remaining populations are widely separated, we expect to see that a. the founder effect becomes increasingly important b. microevolution no longer occurs c. gene flow between populations is reduced d. artificial selection becomes a greater factor in microevolution

What causes darkening of the skin as melanin production increases

Cells are adapted to preform specific functions. which of the following terms refers to this capability?