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. climate
Explanation:
Climate is the repeating pattern of weather and she is wearing these clothes to prevent the cold during winter!
Answer:
D
think of candida as a Corgi and Mexico and a Chihuahua and the .U.S. is a pitbull. it is part of the monroe document,if Asia, or Eroup attack them then we will get involved.
D.
the spanish explorers would treat natives as heathens, while the english, french and dutch were generally on friendly terms with them.
They were very content but also
