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.
6. Evacuate Americans if necessary.
7. Spain.
8. Cuba.
9. Guam.
10. Protectorate.
Answer:
Walmart has an mass production of household appliance
Explanation:
Answer:
explanation:
The new territories reduced the North's dependency on the South for cotton and other raw materials. The cost of gaining new territories in war harmed the South because its smaller economy couldn't afford it.
