A fast-growing town requires a new source of power. Because the town is located by a fast-flowing river, the town council votes to construct a hydroelectric power plant. This requires a dam to be built. How might this activity affect the local watershed? The hydroelectric plant will likely flood the area behind the dam that is constructed.
The hydroelectric plant will likely pollute the water flowing down the waterfall.
The hydroelectric plant will likely pollute the air above the waterfall, leading to acid rain.
The hydroelectric plant will likely quit operating in the summer when the river dries up.

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

In this case, the statement that people who exercise for an hour may have lower cholesterol levels is .

Why did mendel use pea plants in his experiments? a. they have no alleles. b. they are haploid organisms. c. they reproduce quickly. d. they are all male.