This event was a period of rapid diversification of life on Earth, with the appearance of most major animal phyla. This dramatic increase in biodiversity is evident in the fossil record, which shows a sudden abundance and complexity of life forms.
Here's why the Cambrian Explosion is considered the start of the Phanerozoic:
* Rise of complex life: Prior to the Cambrian, life was primarily composed of simple, single-celled organisms. The Cambrian Explosion saw the emergence of complex, multicellular organisms with specialized tissues and organs.
* Fossil evidence: The abundance and diversity of fossils from this period provide clear evidence of a significant evolutionary burst.
* Geological significance: The Cambrian Explosion coincides with a period of major geological changes, including the break-up of supercontinents and the formation of new oceans. These changes may have played a role in the diversification of life.
While the exact causes of the Cambrian Explosion are still debated, it marks a pivotal moment in Earth's history, ushering in the era of complex life that continues to this day.
