Anonnative species of plant is brought into a lake on the propeller of a boat. the plantsurvives and begins to grow rapidly, keeping the sunlight from reaching otherphotosynthesizing organisms. predict what will happen to the other living things that relyon the sun. a. other living things will begin tooverpopulate the lake so that they can getsunlightb. the nonnative species will cause the nativespecies to move to a new habitat. c. native photosynthesizing organisms willbecome less abundant and may die out, d.other organisms that rely on the sun willinstead feed on the new plant for energy.

Which of the following lines of evidence would best support your assertion that a particular plant is an angiosperm? a) it produces seeds. b) it retains its fertilized egg within its archaegonium. c) it lacks gametangia. d) it undergoes alternation of generations.

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

What field of science did harry hess study?