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Biology, 21.06.2019 20:00, u8p4
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
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Biology, 22.06.2019 04:50, luusperezzz
In this experiment, the was intentionally manipulated. it is the independent variable. the dependent variables that were measured were the
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Biology, 22.06.2019 05:30, tiffanybrown703
Identify the composition of oceanic and continental crystal rocks. in a model of earth’s interior, where would these rocks appear?
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Biology, 22.06.2019 05:40, Michcardwell8570
Glycogen is an energy-storage molecule in humans. a hormone that is called insulin controls the storage of glycogen in the liver. insulin is made up of amino acids.
Answers: 2
For biologists, what does the term evolution imply when describing the work out charles darwin?...
Mathematics, 28.01.2020 17:47
Computers and Technology, 28.01.2020 17:47