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Atmosphere, but can be composed of different elements.
carbon dioxide
Precambrian is BEFORE the Cambrian period!
Yesm Mars has a very thin atmosphere mostly composed of carbon dioxide.
Mars's atmosphere is composed of about 2.7% nitrogen.
What evidence shows that the Precambrian atmosphere did not contain oxygen?
The atmosphere, during the Precambrian became richer in oxygen caused by a bacteria called cyanobacteria.
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oxygen
i need help.
autotrophic prokaryotes enriched the atmosphere with oxygen in the precambrian era :) hope this helps
The origin of free oxygen
The Origin Of Free Oxygen.
Igneous rocks can be found in the mountains, which are partially composed of Precambrian plutonic rock.
atmosphere
Helium.
life arose and the atmosphere became enriched in oxygen