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HippoCampus Environmental Science 15 Online
OpenStudy (anonymous):

which organsim appeared on earth first

OpenStudy (anonymous):

hi Welcome to Openstudy @cortes! this may help you :) http://paleobiology.si.edu/geotime/main/htmlversion/archean3.html

OpenStudy (zairahernandez):

Archaea Studies of genetic material indicate that a living group of single-celled organisms called Archaea may share many features with early life on Earth. Many Archaea now live in hot springs, deep-sea vents, saline water, and other harsh environments.

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