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:
C
Explanation:
College interviews will most likely question about the applicant, what,why,how you want or succeed here?
It'll be needed for the interviewer to know how is the applicants socializing skills too, to know how to place the applicant?
The clergy were the religious people of the Middle Ages. Following the pope, in order of rank, there were bishops, priests, monks and nuns. In the latter part of the Middle Ages, the pope, as head of the church, had much influence over the king and total control of the clergy.
Answer:
Early pharaohs had helped conquer enemies and ruled over Egyptian lands.
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