Aresearcher is studying the impact of different community activities on natural resources. which activity is correctly paired with
the level of impact it has on natural resources?
a. little impact when humans exclusively use fossil fuels for power needs
b. great impact when humans use alternative water sources for nondrinking functions
c. little impact when humans plant different types of trees for different uses
d. great impact when humans maintain a diverse diet that includes various protein sources

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