Many present-day animal phyla appeared suddenly in fossils formed 535-525 million years ago, during the Paleozoic era of the Phanerozoic eon. This period is referred to as the Cambrian explosion. Does this period mark the beginning of animal life?
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However, this does not mean that animal life began Show more…
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Findings from layers dating to the Cambrian geological period show an appearance of many new organisms in addition to older forms of life. The Cambrian explosion corresponds to a time where — New species radiated from existing species. New species appeared due to spontaneous mutations. Ancient species were replaced by newly evolved species. A massive die-out freed ecosystems for new species.
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