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>Amendment XIV is about the protection of the laws and the prohibition of Slavery.</span><span />
Answer:
On 8 January 1992, about 20:20 JST, while attending a banquet hosted by the Prime Minister of Japan, Kiichi Miyazawa, U.S. President George H. W. Bush fainted after vomiting in Miyazawa's lap.
Explanation:
Because Antarctica is freezing and its not as hot as Africa and asia
