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Because, right around that time, there was an explosion of bio-diversity. We don't really know why it happened, but the fossil record shows a sudden evolution of many species of life, seemingly out of nowhere. There is no universally accepted theory for why this happened, and it remains a key unanswered question about life on earth.
What else can I help you with?
When did the Phanerozoic eon begin?
The Phanerozoic eon began around 541 million years ago, following the Precambrian eon. It is characterized by the proliferation of diverse complex life forms and is divided into three eras: the Paleozoic, Mesozoic, and Cenozoic.
Why is the Canadian shield also known as the precambrian shield?
The Canadian Shield is known as the Precambrian Shield because it is made up of some of the oldest rock formations on Earth, dating back to the Precambrian Eon. These rocks were largely formed between 4.6 billion to 540 million years ago, before the Paleozoic era began.
What are the first three eons that make up geologic history?
There are 4 Eons not 3, these are :Phanerozoic 540 million years ago to today.Proterozoic 2.5 billion to 540 million years agoArcheozoic 3.9 to 2.5 billion years agoHadean 4.6 to 3.9 billion years ago
About how many years of Earth's history was PreCambrian?
Earth was formed somehwat less than 4.6 billion years ago. The Cambrian Era begins around 542 million years ago. Subtracting these times provides for a PreCambrian Era of around 4 billion years in length. This time period makes up around 87% of Earth's total history.
Was a bee present in the precambrian era?
There were no bees in the Precambrian Super-Eon. In fact there were no insects of any kind in the Precambrian. It is possible that arthropods (the phylum that now includes spiders, insects, centipedes etc) evolved in the Ediacaran Period, the last geological period prior to the end of the Precambrian but these were not insects. The 1st evidence for insects comes from about 396 million years ago during the Devonian Period some 146 million years after the end Precambrian. It was not until 350 million years ago during the Carboniferous Period that there is any evidence of insect flight. The 1st evidence for bees in the fossil record come from the early Cretaceous Period about 100 million years ago. Bees, like ants are specialised wasps. Bees evolved from wasps of the family Crabrondae to specialise in eating pollen and nectar from flowers. The 1st flowers appeared in the fossil record about 140 million years ago but became widespread about 100 million years ago.
When did the Precambrian ended?
About 540 million years ago.
When did the precambrian era end?
About 540 million years ago.
When did Precambrian Time begin?
The Precambrian period was from 4600 million years ago to about 542 million years ago.
Why did the precambrian end?
The Precambrian ended about 541 million years ago.
When did the precambrian first appear?
The Precambrian eon began around 4.6 billion years ago and lasted until about 541 million years ago.
When did the Phanerozoic eon begin?
The Phanerozoic eon began around 541 million years ago, following the Precambrian eon. It is characterized by the proliferation of diverse complex life forms and is divided into three eras: the Paleozoic, Mesozoic, and Cenozoic.
When did the Phanerozoic begin?
about 540 million years ago.
Which Era is the longest Precambrian Paleozic Mesozoic or Cenozoic?
Precambrian
How many years did the precambrian last?
The Precambrian Super-Eon lasted from 4,576.2 until 542 million years ago approximately 4.0422 billion years.
Was the mesozoic era during the precambrien era?
No. The Precambrian Era extended from 4.5 billion years ago to 542 million years ago. The Mesozoic Era lasted from 251 million years ago to 65 million years ago. The Paleozoic Era came in between the two.
Precambrian are fossils yes or no?
Precambrian is a geologic period that extends as back as 4.500 million years ago. Fossils are very rare from that period of time.
Which example best describes life in the precambrian era?
During the late Precambrian, about 560 million years ago, the first confirmed macroscopic multicellular organisms appeared. Around 558 million years ago, the first mollusk, Kimberella,appeared in the fossil record.
