Biology, 19.09.2019 17:30 joeylozier15
List and describe briefly five external factors that must be present or provided to sustain life
Answers: 1
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, 22.06.2019 16:00
Where does oogenesis take place ? seminiferous tubules fallopian tubes ovaries uterus
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Biology, 22.06.2019 21:30
The diagram is represented of a part of a plant cell. identify the locations where proton concentration builds up during photosynthesis and cellular respiration
Answers: 2
List and describe briefly five external factors that must be present or provided to sustain life...
Social Studies, 04.01.2020 02:31
Social Studies, 04.01.2020 02:31