What Caused the Cambrian Explosion?

This documentary investigates the Cambrian explosion, the burst of evolution roughly half a billion years ago when complex animal life suddenly diversified. It weighs the leading theories, from rising oxygen to genetic and ecological triggers, that might explain why so many body plans appeared in a geological blink. The film keeps the reasoning visible, marking the line between evidence and informed speculation. It is a thoughtful deep dive for anyone curious about one of life's great turning points. Free to watch in HD on Dr Documentary.

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