Historically, Poland has been part of the barrier against the steppe invassions, first the Mongols, then the Russians themselves. From that point of view, it would be central Europe, as the steppe peoples would be eastern Europe. Poles often lived within the HRE, which would place them squarely in the Mittel-europa.
The Cambrian Explosion refers to the metaphorical explosion of life that began 542 million years ago and lasted for roughly 40 million years. This lesson will cover the events that occurred during this time period.
Professor Brian Cox visits the Burgess Shale, a very important fossil field in Yoho National Park in the Canadian Rocky Mountains. The fossils record the explosion of life that started about 540 million years ago during the Cambrian period.He explains a speculative theory that the evolution of creatures with eyes, such as trilobites, triggered the evolution of more complex forms of life.he Cambrian is famed for its explosion of abundant and diverse life forms. Life had diversified into many forms and many ways of living: animals now swam, crawled, burrowed, hunted, defended themselves and hid away.