2 - A tabela apresenta algumas características de algumas classes do filo Arthropoda: Classe Característica 1 Corpo dividido em cefalotórax e abdome;2 pares de antenas. 2 Corpo dividido em cabeça, tórax e abdome;3 pares de patas no tórax. 3 Corpo dividido em cefalotórax e abdome;sem antenas. Na tabela, Arachnida, Crustacea e Insecta estão respectivamente representados pelos números: * ( )1, 2 e 3. ( )1, 3 e 2. ( )2, 3 e 1. ( )3, 1 e 2. ( )3, 2 e 1.

The bacteria found in a soil is usually harmful and measure are taken to remove any traces of microorganisms 1. true 2. false

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

19. a cell is viewed under a microscope and is found to have two nuclear envelopes and spindles that appear to be breaking apart. which phase of mitosis is the cell most likely in? a. metaphase b. prophase c. telophase d. anaphase