The Cambrian explosion was a major diversification of animal life that unfolded early in the Cambrian period, which began around 538. 8 million years ago. During this interval, marine animals became much more varied, building the foundations for current marine ecosystems.

Source: [Phys.org](https://phys.org/news/2026-10-algae-fossils-cambrian-explosion-hint.html)

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