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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.
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What are the 4 time periods?
Starting with the Precambrian Era. 4600 million to 570million years ago. Paleozoic Era. 570 million to 245 million years ago. Mesozoic Era. 245 million to 66 million years ago. Cenozoic era: 66 million years to Today.
What are some organisms that have endoskeletons?
Some in the Precambrian Super Eon, but mostly hard parts came along in the Cambrian period at about 540 mya (Million Years Ago)
What was Lasting from 540-248 million years ago?
The Paleozoic Era lasted from 542 to 251 million years ago.
When did the Phanerozoic eon begin?
about 540 million years ago.
When was the Age of the Invertebrates?
The Cambrian Period, 540 to 505 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 precambrian end?
The Precambrian ended about 541 million years ago.
Why did the precambrian end?
The Precambrian ended about 541 million years ago.
When did the Phanerozoic begin?
about 540 million years ago.
What are the 4 time periods?
Starting with the Precambrian Era. 4600 million to 570million years ago. Paleozoic Era. 570 million to 245 million years ago. Mesozoic Era. 245 million to 66 million years ago. Cenozoic era: 66 million years to Today.
What are some organisms that have endoskeletons?
Some in the Precambrian Super Eon, but mostly hard parts came along in the Cambrian period at about 540 mya (Million Years Ago)
What was Lasting from 540-248 million years ago?
The Paleozoic Era lasted from 542 to 251 million years ago.
When did the Phanerozoic eon begin?
about 540 million years ago.
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.
What era started 4.6 billion years ago?
the mesozoic era started 225 million years ago .
