There were no life forms as we know them during the Proterozoic period. With oxygen just then being accumulated in the earth's atmosphere, it brought the first advanced single-celled eukaryotes and multi-cellular life forms.
The answer is Proterozoic.
they were probably the first multicelluar life- forms
The longest in geological time is an Eon eg. Archeozoic Eon . Edit: there is also the supereon, which is usually composed of 2-3 eons.
According to the theories of Charles Darwin complex forms of life evolved over long periods of time from simpler forms.
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The Eon from 2.5 to 0.542 billion years ago is known as the Proterozoic Eon. It was a crucial period in Earth's history marked by the formation of complex life forms and significant geological changes.
The Proterozoic is a geological eon that spans from around 2.5 billion to 541 million years ago. It is characterized by the appearance of complex life forms, including the first multicellular organisms and the rise of eukaryotic cells. The Proterozoic also saw the formation of vast supercontinents, significant changes in Earth's atmosphere, and the development of oxygen-producing photosynthetic organisms.
The middle Proterozoic comes the first evidence of oxygen build up in the atmosphere. This is how the eukaryotes formed. They include multicellular algae.
The Proterozoic eon was the third eon in Earth history. It lasted from 2.5 billion years ago to 542 million years ago. Therefor, the Proterozoic was nearly 2 billion years long.Read more: How_long_did_the_proterozoic_era_last
The Archean and Proterozoic Eons make up the Precambrian Eon, which spans from the formation of the Earth around 4.6 billion years ago to the beginning of the Phanerozoic Eon around 541 million years ago. This period is characterized by the development of early life forms and significant geological transformations.
The period that followed extensive glaciation in the Precambrian is called the Proterozoic Eon. This period was characterized by the development of complex life forms and the formation of supercontinents.
The Eon represents a period of time in Earth's history lasting from 2.5 billion to 544 million years ago. It is further divided into several Eras, including the Archean and Proterozoic. This Eon is characterized by the formation of Earth's first continents, the emergence of early life forms, and the development of more complex organisms.
the eon that constitutes the earlier (or middle) part of the Precambrian, in which there was no life on earth. It precedes the Proterozoic eon. Also called azoic .
The Proterozoic Eon began around 2.5 billion years ago and ended approximately 541 million years ago. It was a significant period in Earth's history characterized by the appearance of multicellular life forms and the formation of the first supercontinents.
The answer that you are looking for is very simple the answer is a WALRUS. you are very welcome i can give the answer for anything ant time you need it! and finally you are very smart.
Hadean, Archeozoic, Proterozoic, Phanerozoic
Most of Earth's history occurred in the Proterozoic eon, which lasted from about 2.5 billion to 541 million years ago. This eon saw the rise of early life forms, the formation of continents, and significant changes in the Earth's atmosphere and oceans.