Which process made an increase in chemical energy for cell activities in organisms living on the earth possible?
a change from a primitive atmosphere, which was about 70 percent nitrogen, to
an atmosphere that was 70 percent oxygen
the development of plants that could add more water vapor to the atmosphere,
increasing the earth's water supply
the discovery of ATP and ADP by scientists for use in the metabolic processes of
cells
a change from a reducing atmosphere where there was no free oxygen to an
oxidizing environment where free oxygen was abundant

Analyze the central conflict and its in a story to discover the theme. o resolution o protagonist antagonist character

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

Red flowered snapdragons are crossed with white flowered snapdragons, producing all pink snapdragons in the f1 generation. what would you expect if you crossed pink with pink? 3/4, 1/4, 1/2 red, 3/4,/1/2,/1/4 pink,1/2, 3/4, 1/4 white