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:
Genocide and terrorism
Explanation:
<em>Genocide and terrorism</em> are primarily about killing individuals or groups. Violent and intentional. The <em>difference</em> between genocide and terrorism is that terrorism is always a symbolic act of doing so. While genocide can be a also secret besides a public act. Genocide is also always the act of killing multiple groups of people, while terrorism can be a single act.
Examples of<em> terrorism</em>, unfortunately, often happen today. It happens most often between religions, attacking the opposite.
<em>Genocide </em>occurs nowadays also<em>, but </em>occurred most in World War I and World War II, as well as in other wars and recent history.
Answer:
The Harlem Renaissance was a golden age for African American artists, writers and musicians. It gave these artists pride in and control over how the Black experience was represented in American culture and set the stage for the civil rights movement.
Explanation:
These leaders were called xyz, because they never gave the Patriots their names. This was known as the xyz affair.