Answers: 2
Biology, 21.06.2019 20:00
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
Answers: 3
Biology, 21.06.2019 23:30
Of seawater increases with decrease in the temperature. therefore, the cold water sinks to the deeper layers at the bottom
Answers: 1
Biology, 22.06.2019 13:50
2points what do bacteria have in common with the cells of other living organisms?
Answers: 2
Biology, 22.06.2019 14:00
Homo heidelbergensis was a tall, muscular hunter, who used both tools and weapons. because h. heidelbergensis was not a gatherer/forager, but ate a varied diet including meat and fish, we would expect to see what anatomical changes?
Answers: 1
The population distribution for a country shows that each age structure is about the same size. what...
English, 27.12.2021 04:30
English, 27.12.2021 04:30
Chemistry, 27.12.2021 04:30
English, 27.12.2021 04:30
Mathematics, 27.12.2021 04:30
Biology, 27.12.2021 04:30
Chemistry, 27.12.2021 04:30
World Languages, 27.12.2021 04:30
English, 27.12.2021 04:40