:00:24
[Narrator] Mutation--it is the key to our evolution.
:00:27
It has enabled us to evolvefrom a single-celled organism...
:00:31
into the dominant specieson the planet.
:00:33
This process is slow and normally takingthousands and thousands of years.
:00:38
But every few hundred millennia,evolution leaps forward.
:01:37
[Men Shouting]
prev.