Most researchers attribute the appearance of skeletons to some arbitrarily chosen factors.Many aspects of the phenomenon(the diversity of the composition of the remains,the mass nature of the phenomenon,geological immediacy,the role of geological and biotic factors,etc.)remain unexplained in this case...
The Cambrian Explosion was a dramatic burst of evolutionary changes in life on Earth. During the Cambrian Period, which began about 540 million years, trilobites were the dominant species.
The first life forms appeared, and the evolution of these life forms started at the end of the Precambrian era. This transition is referred to as the Cambrian explosion. How did the Precambrian era start? The Precambrian era started with the formation of the solar system, planets, moons, ...
Corrie holds master's in elementary education, taught elementary ESL in the public schools for 5 years, and recently was teaching EFL abroad. The Paleozoic Era lasted about 300 million years and is credited with two major events in Earth's history, the Cambrian Explosion and Permian Extinction!
Precambrian, period of time extending from about 4.6 billion years ago (the point at which Earth began to form) to the beginning of the Cambrian Period, approximately 541 million years ago. The Precambrian represents more than 80 percent of the total geo
Paleozoic Era, major interval of geologic time that began 538.8 million years ago with the Cambrian explosion, an extraordinary diversification of marine animals, and ended about 252 million years ago with the end-Permian extinction, the greatest extinct
By the end of the Proterozoic Eon, the atmosphere was rich in free oxygen. The scene was set for theCambrian Explosion– the sudden and explosive diversification of living things that occurred at the beginning of the Paleozoic Era. Discover More With Active Wild ...
Jellyfish fossils have been found from the Cambrian period, dating back over 500 million years ago. Some jellyfish are bioluminescent, meaning they can produce their own light to startle predators. The Australian box jellyfish is one of the most venomous creatures in the ocean. Jellyfish can ...
The first animals appeared during the Cambrian explosion 500 to 600 million years ago. They were jawless fish with no vertebral column but a skull to protect their brain. After the fishes, amphibians, mammals, reptiles, birds, and so on evolved. These groups initially possessed an essential...
After the Cambrian Period came the 45-million-year Ordovician Period, which is marked in the fossil record by an abundance of marine invertebrates. Perhaps the most famous of these invertebrates was the trilobite, an armored arthropod that scuttled around the seafloor for about 270 million years ...