WitrynaAnswer: cyanobacteria evolved as the first photosynthetic organisms over 2.5 billion years ago, Advertisement. WitrynaIt shows us that the first organisms on Earth were simple bacteria that dominated the Earth for several billion years. Beginning about 540 million years ago more complex …

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Witryna28 lut 2024 · The Proterozoic eon began about 2.5 billion years ago and ended about 500 million years ago when the first complex lifeforms appeared. During this period, the Great Oxygenation Event transformed the Earth's atmosphere, allowing for the evolution of aerobic organisms. The Proterozoic was also the period in which the Earth's first … WitrynaDating of the geologic record. The geologic record is the strata (layers) of rock in the planet's crust and the science of geology is much concerned with the age and origin of all rocks to determine the history and formation of Earth and to understand the forces that have acted upon it. Geologic time is the timescale used to calculate dates in the … city hibs belfast

General Biology II Flashcards Quizlet

WitrynaThe Earth is _____ years old. What organism first dominated Earth? When was the most severe mass extinction in Earth's history? Paleontologists have identified many possible causes of mass extinctions. What has not been identified by paleontologists as an agent of mass extinction? Rates of extinction today are___. Witrynaoldest Era, began 4.6 billion years ago...bacteria and algae dominated, later in the era soft organisms like jellyfish appeared, for most of the era the earth was covered with … Witryna4. 100,000 years in the geologic history of Earth would be considered A. Immensely long B. A drop in the bucket C. Half of Earth's history D. An extremely significant amount of time 5. Understanding geologic time is significant because it helps us ... Which organism first dominated Earth? A. Dinosaurs B. Insects C. Plants D. Fish E. Bacteria. E. did battle breakers get shut down