burgess shale (b.c.)

Explains why the diversity of the Burgess Shale is important in understanding our past and evolution.

Examines the "Cambrian explosion," which occurred 550 million years ago when all the major animal groups suddenly appeared. Presents the "Light Switch Theory" to explain why the flourishing of life appeared, which states that "the development of vision in primitive animals" caused the explosion.

Explains why the diversity of the Burgess Shale is important in understanding our past and evolution.