In the process of continental drift, sometimes chunks of continents disappear. How can this happen? the crust is subducted back into the mantle to be recycled/la corteza se subduce nuevamente en el manto para ser reciclada

the crust is weathered away/la corteza está desgastada

the crust melts in with magma previously ejected from nearby volcanoes/la corteza se derrite con magma previamente expulsado de volcanes cercanos

the crust was abducted and never seen again/la corteza fue secuestrada y nunca más se volvió a ver

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

Which of the following human activities resulted in the growth of the north american deer population?

Which could be a pathway of food through an ecosystem