When did atmospheric O2 levels first rise high enough to support aerobic respiration continuously? the Cretaceous/Tertiary extinction from an asteroid impact in Mexico (~65 million years ago)cyanobacterial synthesis of atmospheric oxygen levels above 2% (~2.0 billion years ago)the collision of the Earth with a planet larger than Mars (~4.52 billion years ago)the Permian/Triassic extinction due to meteorites and volcanoes (~250 million years ago)colonization of Earth’s oceans with the first archaeobacterial cells (~3.85 billion years ago) Which of the following eukaryotic organelles contains 3 membranes (with 1 opaque to light)?the mitochondrionthe peroxisomethe chloroplastthe lysosomethe nucleus

The early atmosphere on the Earth formed from the gases that spewed from the volcanoes. It consisted of hydrogen sulfide, methane, and carbon dioxide. The levels of carbon dioxide were 200 times much more than at present. The atmosphere in the earliest times does not consist of oxygen. Oxygen came onto the Earth when the early form of life, such as cyanobacteria, appeared underwater. When their community got increased, it leads to a rise in oxygen levels in the atmosphere.The Earth's atmosphere first gained significant amounts of oxygen was around 2.4 billion to 2.3 billion years ago. This event is also known as the Great Oxygenation Event. Without this event, the existence of life on the Earth would not be there. The correct statement that signifies this event is 2. Hence the correct option is 2Statement 1 is incorrect because the Cretaceous/Tertiary occurred much later, which is around 66 Million years, than the first rise in oxygen levels in the atmosphere. Though the carbon dioxide levels were significantly raised after the volcanic activity by meteoric impact during the Cretaceous-Tertiary event, there was a sufficient amount of oxygen present in the atmosphere. Statement 3 is incorrect because when the Earth collided with a planet larger than Mars at that time, it was not cooled properly, and the crust of the Earth was also not formed. There was no oxygen present at that time. Oxygen came when the Earth cooled, and the atmosphere was formed. Statement 4 is incorrect because the Permian Triassic event occurred around 251.9 million years. The oxygen was in a sufficient amount till this time in the atmosphere. The species came into the Earth till this time, which led to around 96% of species' extinction. They died and got extinct because of the transgression. Statement 5 is incorrect because the colonization of the Earth's oceans with the first archaebacterial cells occurred around 3.85 billion years, and till this time, the oxygen levels were the least. The first rise in oxygen occurred around 2.4 to 2.3 billion years.The statement signifying the first rise in oxygen levels is statement 2. It only relates to the Great Oxygenation Event. Hence statement 2 is the correct option.

Answered: When did atmospheric O2 levels first…

Applications and Investigations in Earth Science (9th Edition)

9th Edition

ISBN:9780134746241

Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa

Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa

Chapter1: The Study Of Minerals

Section: Chapter Questions

Problem 1LR

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When did atmospheric O₂ levels first rise high enough to support aerobic respiration continuously?

the Cretaceous/Tertiary extinction from an asteroid impact in Mexico (~65 million years ago)
cyanobacterial synthesis of atmospheric oxygen levels above 2% (~2.0 billion years ago)
the collision of the Earth with a planet larger than Mars (~4.52 billion years ago)
the Permian/Triassic extinction due to meteorites and volcanoes (~250 million years ago)
colonization of Earth’s oceans with the first archaeobacterial cells (~3.85 billion years ago)

Which of the following eukaryotic organelles contains 3 membranes (with 1 opaque to light)?