Cyanobacteria, also known as "blue-green algae", are the unicellular organisms which are able to produce oxygen.
Approximately 540 years ago, the atmosphere was very poor on oxygen. Cyanobacteria are thought to be responsible for the oxidization of the atmosphere back then, in an event known as <em>"The Great Oxygenation Event"</em>. As a result, Earth's life forms suffered drastic changes in their composition, as they evolved from being <em>anaerobic</em> to becoming organisms <em>highly dependant</em> on oxygen. The oxygenation of the atmosphere would eventually provide the adequate environment in order for the <em>Cambrian Explosion</em>, or the first diversification of living organisms, to happen.
<span>Lincoln was threatened by Maryland dues to its close proximity to Washington DC.
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Answer:
x= 132
Explanation:
The sum of all interior angles is (n-2)x180 while n=number of sides. So (6-2)x180=720. The angles you have add up to 588. All you need to do now is 720-588.
Archaeology is the study of cultures that lived in the past. It is a subfield of anthropology, the study of human cultures. ... Archaeologists look for patterns in the artifacts they study that give them clues about how the people who made and used them lived.
Islam helpdspread Arabic culture was to make Arabic the everyday language of the people in the area of which it spread
