what is true of the cambrian explosion?

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The Cambrian Explosion is the period in Earth’s history where the first fossil records of ancestors and early forms of many modern metazoan (invertebrates) come from. Although the Cambrian lasted approximately 40 million years, a relatively short period of time in the history of the Earth, the era produced almost suddenly an astonishing plethora and diversity of life in the oceans of the ancient Earth, hence it’s given name ‘explosion’. Scientists believe that around this time the oceans became saturated in oxygen, mixing up a primordial soup of the stuff of life, and the extant species took advantage of the new environment to spectacular ends.

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