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The History Of Life On Earth (Crash Course)
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The History Of Life On Earth (Crash Course)
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9 Questions

1. It's believed that Cyanobacteria brought what into the world?

2. About 4.4 billion years ago, there was how much oxygen in the atmosphere?

3. What eon are we living in now?

4. What's the term for when all of a sudden there was a lot of multi-celled eucaryotes?

5. What is the term used for single celled organisms that don't have a nuclei?

6. Scientists have labeled three eons in Earth history. What is the first?

7. It's believed that what evolved from parasitic procaryotes?

8. The nucleic acid that's probably the first genetic material is called what?

9. Approximately how long was it before procaryotes stopped being the only living thing on earth?

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