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.
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The Louisiana purchase
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with more land, slaves and travelers settled in
D should be the right answer. :)
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The New Jersey Plan was the proposal for the structure of the US Federal Government. It was presented by William Paterson in 1787. It was presented to counter the Virginia Plan. His motive was to provide each state with one vote in the National legislature regardless of their size. Although the plan was rejected, it did impact the Great Compromise of 1787 which shaped the American Government in the way it exists today.
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The group that favored the new federal Constitution was called the “Federalists”. They argued that the separation of powers and checks and balances system created in the new Constitution protected the people. No one group could control the other two.
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