D. Since (19,11) and (19,10) have the same x value, it fails the vertical line test
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:
Many Americans learn about Boston, as it concerned with the dealing of the colonists and the British.
Explanation:
Boston harbour was the main port for exporting and importing goods and was an essential maritime shipping centre. Having control of Boston was an advantage for the British as they exercise the Stamp Act and the Townshend Acts. Boston Massacre occurred in Boston in 1770, when the colonists began to throw stone, sticks, and snowball at the British troops who posted in the city. The view soon became disordered, and the British guards fired shots into the crowd and killing five civilians.
The Boston Massacre encouraged the people to unite and a call for patriotism in the colonies.
Ballet, Modern, Hip-Hop, Ballroom, Folk Dance, Performance Art.
