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Questions and Answers
Which event led to the accumulation of free oxygen in the atmosphere?
Which event led to the accumulation of free oxygen in the atmosphere?
- Events of the existence of the Universe Macromolecules
- The Great Oxygenation Event (correct)
- Oldest fossils of prokaryotes
- O2 begins to accumulate in the atmosphere
What caused the Ordovician-Silurian mass extinction?
What caused the Ordovician-Silurian mass extinction?
- A gamma-ray burst from a hypernova (correct)
- Events of the existence of the Universe Macromolecules
- O2 begins to accumulate in the atmosphere
- The Great Oxygenation Event
What event resulted in the killing of 96% of marine and 70% of land species?
What event resulted in the killing of 96% of marine and 70% of land species?
- The Cretaceous-Paleogene extinction event
- The Great Dying (correct)
- The Great Oxygenation Event
- The Ordovician-Silurian mass extinction
Which organisms were responsible for the accumulation of free oxygen in the atmosphere?
Which organisms were responsible for the accumulation of free oxygen in the atmosphere?
When did the first vertebrates - fishes appear?
When did the first vertebrates - fishes appear?
Which event caused the accumulation of free oxygen in the atmosphere?
Which event caused the accumulation of free oxygen in the atmosphere?
What is the estimated time of the Ordovician-Silurian mass extinction?
What is the estimated time of the Ordovician-Silurian mass extinction?
Which event resulted in the highest percentage of species extinction?
Which event resulted in the highest percentage of species extinction?
When did the first vertebrates (fishes) appear?
When did the first vertebrates (fishes) appear?
What caused the accumulation of oxygen in the atmosphere during the Great Oxygenation Event?
What caused the accumulation of oxygen in the atmosphere during the Great Oxygenation Event?
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Study Notes
Oxygenation of the Atmosphere
- The Great Oxygenation Event led to the accumulation of free oxygen in the atmosphere.
- This event was caused by the activities of oxygen-producing cyanobacteria.
Mass Extinctions
- The Ordovician-Silurian mass extinction was caused by an unknown event.
- This extinction event occurred around 443-485 million years ago.
- It resulted in the killing of 96% of marine and 70% of land species.
- The Permian-Triassic extinction event resulted in the highest percentage of species extinction, with 96% of marine and 70% of land species wiped out.
Evolution of Vertebrates
- The first vertebrates, fishes, appeared around 530 million years ago.
Notable Facts
- The Great Oxygenation Event, which occurred around 2.7 billion years ago, was responsible for the accumulation of free oxygen in the atmosphere.
- This event had a significant impact on the evolution of life on Earth.
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