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The first organism appeared during the Proterozoic period. It is estimated that the first organism appeared between 2.5 and 3.8 billion years ago.

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What is the oldest era geologically?

The oldest geological era is the Precambrian period. It is the period of Earth's formation, as well as the origin of the first single and multi-celled organisms.


During what era were the first one-celled organisms formed?

During the Archean Eon life started and was dominated by one-celled prokaryotic life forms. Eukaryotic one-celled organisms became dominant in the Proterozoic Eon. Multicellular organisms ruled the planet during the eon known as the Phanerozoic.


What geological era's rocks were first studied in Germany's Jura mountains?

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What is present geological era?

Cenozoic Era


What is the third geological era?

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The first organisms evolved during the Archean Eon, which occurred from approximately 4 billion to 2.5 billion years ago. This era was characterized by the development of simple, single-celled organisms like bacteria and archaea.


Is the meozoic era the first?

No, the Mesozoic Era is not the first geological era. It is the era that followed the Paleozoic Era and preceded the Cenozoic Era in Earth's history. The Mesozoic Era is known for the age of the dinosaurs and lasted from about 252 million years ago to 66 million years ago.


What is the most recent geological era?

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What are four divisions of geological time?

Precambrian Era, Paleozoic Era, Mesozoic Era, Cenozoic Era


In which Geological era did early man appear first?

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The first land-dwelling organisms, which were likely plants and fungi, appeared during the Paleozoic Era. This transition from aquatic to terrestrial environments occurred around 460 million years ago during the Ordovician period.