Primary source is an artifact, a document, diary, manuscript, autobiography, a recording, or other source of information that was created at the time under study.
Humilating PersianDefeat-Marathon
Persian Leader-Cyrus
Athenian Naval Victory-Salamis
Burned Athens-Persia (ahem 300)-
Narrow Straight of Water-Bosporus
C kingdoms are ruled by one person but a state has many governments like California
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.
Answer: Germans: More than 1.5 million between 1820 and 1860. The 1850s was the single biggest decade for German immigration, with some 951,000 reaching the United States. Why They Came Irish: Most emigrated to escape grinding poverty in Ireland—or to avoid outright starvation in the years of the potato famine.
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