Arrange these components of the mammalian immune system as it first responds to a pathogen in the correct sequence
pathogen is destroyed
lymphocytes secrete antibodies
antigenic determinants from pathogen bind to antigen receptor on lymphocytes
lymphocytes specific to antigenic determinants from pathogen become numerous.
only memory cells remain
i -> iii -> ii -> iv -> v
iii -> ii -> i -> v -> iv
ii -> i -> iv -> iii -> v
iv -> ii -> iii -> i -> v
iii -> iv -> ii -> i -> v

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

Aplant may open end close its stomata to prevent excess water loss and maintain

Drag each tile to the correct box. arrange the layers and faults from oldest to youngest.