Part 7/10:

The Cambrian Explosion: The Dawn of Complex Life

The Cambrian Explosion, occurring around 538 million years ago, presents the third mystery in Earth's historical narrative. During this period, life diversified dramatically, with complex organisms appearing abruptly in the fossil record. Prior to this event, evidence of life was scant, comprising mostly unicellular organisms, leading Darwin to regard this phenomenon as an unresolved conundrum within evolutionary theory.