The Cambrian Explosion: When Life Began?
Summary
This episode delves into the Cambrian Explosion, a pivotal period 538 million years ago when complex animal life rapidly emerged in Earth's oceans. Host Tristan Hughes and guest Henry Gee discuss the triggers behind this evolutionary burst, including ocean oxygenation and mineral influx from continental collisions. They explore key innovations like the evolution of the through gut, eyes, and hard parts, examining iconic fossils such as trilobites, the strange Ediacaran fauna, and the earliest known vertebrates like four-eyed fish from the Chengjiang fauna, highlighting how this event laid the foundation for modern animal groups.Episode description
538 million years ago, life on Earth changed forever. In an evolutionary burst known as the Cambrian Explosion, complex animals rapidly appeared in the oceans, laying the foundations for almost every major animal group alive today.
Tristan Hughes is joined by the mighty Henry Gee to explore biology’s 'Big Bang'. What triggered this extraordinary leap in evolutionary complexity? Why did creatures with eyes, shells and limbs emerge so suddenly in the fossil record? And what can the Cambrian Explosion reveal about the origins of animal life and the history of our planet?
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Presented by Tristan Hughes. Audio editor is Aidan Lonergan. The producer is Joseph Knight. The senior producer is Anne-Marie Luff.
All music courtesy of Epidemic Sounds
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