Earlylife-formsandEarth’sAtmosphere
2018-05-14 11:46:31 2 举报AI智能生成
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why life flourish on earth
the position to sun
early life-forms altered the environment
earliest atmosphere
from volcanoes
methane and carbon dioxide
early 》present
warm the earth when the sun not brigjhly
Earth’s modern atmosphere differs from earlist
photosynthetic life-forms transformed the chemical composition of Earth’s atmosphere
remove carbon dioxide
release O2
oxygen release improved conditions for life
is essential for
the metabolic process
form a protective shield
today ozone shield absorbs UV
early :water absorbed the UV radiation
other planet ： no
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