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Episode Guide
- 1. The Infinite Variety Jan 16, 1979
- A worldwide search for early life forms. Narrated by David Attenborough.
- 2. Building Bodies Jan 23, 1979
- Exploration of Australia's Great Barrier Reef, home to marine life forms.
- 3. The First Forests Jan 30, 1979
- David Attenborough looks at the ways plant life overcame the problem of migration from sea to land.