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By the end of the Cambrian period, all major body plans and major groups of organisms had evolved.
What is meant by Cambrian explosion?
Between 541 million and around 530 million years ago, at the start of the Cambrian Period, there was an unmatched emergence of species known as the Cambrian explosion. Many of the major phyla (between 20 and 35) that make up contemporary animal life appeared during the event, which was distinctive.
What caused the Cambrian explosion?
Life on Earth was halted by oxygen variations.
Given the significance of oxygen for creatures, experts hypothesized that the Cambrian explosion may have been triggered by a sudden rise in the ocean's concentration of the gas to levels close to those of today.
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