The following are the steps for b-cell activation. the steps are in an incorrect order.
1. b cells display antigens in mhc class ii receptors on the cell surface.
2. antibodies released by plasma cells bind to antigen so they will be destroyed by other cells of the immune system.
3. b cells rearrange their dna to create a unique b-cell receptor.
4. b cells become activated by interacting with t cells.
5. b cells undergo clonal expansion.
6. b cells digest antigens that bind to the antibodies on their surface.

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

Study the diagram of a cell. which structure is found only in plant cells and functions in the process of photosynthesis? w x y z

Dan made the table shown to describe two different relationships between animals. organism interactions relationship a relationship b one organism lives inside the organism it feeds off no organism is harmed which of the following statements is most likely correct?