Early Earth

Topics: Oxygen, Carbon dioxide, Earth Pages: 4 (964 words) Published: March 18, 2013
Living Cells originated at a time when the atmosphere and environment were different to those presently found on earth Archaea are single cell micro-organisms with no nucleus, it use anaerobic respiration (able to living in the absence of Oxygen) and live in extreme environment/condition such as high temperature, acid-rich, saline area etc. those environment are rich in minerals but hazardous to other organisms. Archaea’s population decreased after earth filled with oxygen, other than that, current archaea is very same as ancient archaea. Archaea like to live near Black Smoker (volcanoes under ocean) due to the amount of carbon dioxide, high temperature and rich mineral it provide. Archaea is important in our ecosystem and it carry out methanogenesis cycle and nitrogen cycle. Methanogenesis cycle convert carbon Dioxide to methane, nitrogen cycle convert of nitrogen in the atmosphere into biological nitrogen. Cyanobacteria are single-celled organism lived in water and soil, it can tolerate great ranges in salinity and temperature. Mostly found around open area where sunlight are presented. Cyanobacteria were also the first organisms use photosynthesis on Earth which release oxygen as waste product, because of that, they tiled the balance of early Earth dramatically by increase oxygen level and reduce carbon dioxide. After iron filled with oxygen to form rust, more oxygen released in atmosphere to form ozone to protect cells from UV-ray and Earth become more suitable for life.

The evolution of photosynthesis shift the balance of gases in the atmosphere Banded iron formation support the theory that photosynthesis shifted the balance of gases in the atmosphere. BIF are sedimentary rock formed when oxygen start to formed, it contain thin layer of iron oxide (using the first fresh-made oxygen from Cyanobacteria’s photosynthesis to form rust) and silica (skeleton of anaerobic organism poisoned by oxygen) settled under ocean, these Formation occur around 2 billion...
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