Respuesta :

heera

in the early atmosphere, the earth had no trees, and the gases were mainly, carbon dioxide, methane and nitrogen. no oxygen.

when plants began appearing, it increased oxygen in atmosphere, and decreased carbon dioxide, which was also dissolved into oceans forming within sedimentary rocks.

this increase in oxygen continued, and helped create human life.

alexanderpetch

Answer:

rising temperatures, droughts, shifting patterns of precipitation and longer growing seasons, plants and animals are evolving to keep pace. Biologists have observed squirrels and salmon developing at an accelerated pace, causing them to reproduce at a younger age.

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