Thomas Halliday describes the Devonian when plants and fungi formed symbiotic root systems to colonize land alongside the giant lichen Prototaxites, then visits Silurian deep-sea hydrothermal vents where life may have originated.

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Thomas Halliday describes the Devonian when plants and fungi formed symbiotic root systems to colonize land alongside the giant lichen Prototaxites, then visits Silurian deep-sea hydrothermal vents where life may have originated.

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Thomas Halliday concludes with the climate-driven Ordovician mass extinction, the Cambrian explosion of modern animal body plans in China featuring predators like Omnidens, and the Ediacaran era's strange soft-bodied organisms preceding complex life.

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