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:Berber, self-name Amazigh, plural Imazighen, any of the descendants of the pre-Arab inhabitants of North Africa. The Berbers live in scattered communities across Morocco, Algeria, Tunisia, Libya, Egypt, Mali, Niger, and Mauritania. They speak various Amazigh languages belonging to the Afro-Asiatic family related to ancient Egyptian.
Explanation:
Motivations for colonization: Spain's colonization goals were to extract gold and silver from the Americas, to stimulate the Spanish economy and make Spain a more powerful country. Spain also aimed to convert Native Americans to Christianity.
Spain was considered to have as three main goals behind its expeditions to North America: the expansion of its empire, the attainment of wealth, and the spread of Christianity. It is easily forgotten that monarchies were not possessed of endless wealth.
Migrants from China came in large numbers to participate in the gold rush.
