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9.- Ozone layer and eukaryotes show up in the Proterozoic eon

Deleted user 9 questions Updated 7 Sep 2016

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Questions in this quiz (9)

11) When do we have the first certainty of life?
1. AArchean eon
2. BProterozoic eon
3. CHadean eon
2When did Proterozoic Eon start up?
1. A25 billion years
2. B2.5 billion years
3. C2.5 million years
3What happened with the oxygen first released by cyanobacteria?
1. AIt began to be used by living things
2. BIt began to saturate the iron
3. CIt killed the rest of living things
4What type of record do we have to use for knowing when oxygen was accumulated first?
1. AGeological records
2. BEnvironmental records
3. CFossil records
5What was GOE (great oxygenation event)?
1. AAn increasing of atmospheric oxygen 4.8 million years ago
2. BIt becomes an oxygen rich enough environment for eukaryotic cells
3. CThe mayor increasing of oxygen ever in our planet
6Why GOE is also known as the “Oxygen Catastrophe”
1. AIt produced the biggest fire ever
2. BIt oxidized all living things
3. CIt killed next to all anaerobic living things (greatest extinction ever)
7Why U.V radiation prevent from life arising on land?
1. AIt avoided aquatic living things from come out from water
2. BIt produced important damage on DNA
3. CIt produced sunburn on living things
8What element permits us to live on land nowadays?
1. AThe greenhouse effect
2. BThe ozone layer
3. CThe high concentration of O2
9What is the relationship between GOE and U.V radiation that allow us to dwell on land?
1. AThe ozone/oxygen cycle
2. BThe oxygen/U.V radiation interaction
3. CThe oxygen/ozone interaction

Description: https://www.khanacademy.org/science/cosmology-and-astronomy/life-earth-universe/history-life-earth-tutorial/v/ozone-layer-and-eukaryotes-show-up-in-the-proterozoic-eon
Author: Deleted user
Language: English
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History: Created on 6 Sep 2016 · updated on 7 Sep 2016
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