第21期：地球的生命

Amidst the decay, hidden from sight, life is stirring. Soon seeds will germinate, plants will grow, and this wasteland will live again.

Life seems to have conquered the planet. But will it last?

A herd of creatures graze the Siberian plains, and they are big. Evolution takes a huge leap forward, small lizards are now giant reptiles.

These scutosaurs are distant relatives of turtles. If these plant eaters look tough,

the carnivores must be seriously mean. Like this gorgonopsid.

A perfectly engineered pre-historic killing machine.