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.
I would say A would be your best option
Does it give you options to choose from?
9. The two state solution is an idea that there would be two independent and sovereign states, one for Israel and one for Palestine, and they would be based around their people and would not try to influence each other's politics or would not try to fight or anything similar and would stick to the deal when it comes to border disputes.
10. The United States firmly supports the two state solution and has historically tried to remain neutral and not take sides in the conflict, as long as human rights are preserved by both sides. There were some presidents who sometimes seemed to support more one side or the other, but the official stance is that a two state solution is the best one.
The best completion to the diagram on Jim Crow laws was that D. Public services become racially segregated.
<h3>What happened after Jim Crow laws were enacted?</h3>
Jim Crow laws were passed to subjugate African Americans and to keep them separate from White people.
As a result, segregation became the norm in the South with public services for both African Americans and Whites being different.
Find out more on Jim Crow Laws at brainly.com/question/452378.
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