| 释义 |
Cambrian Explosion
Cambrian Explosionn. The rapid diversification of multicellular animal life around the beginning of the Cambrian Period, resulting in the appearance of almost all modern animal phyla.Cambrian Explosion The rapid diversification of multicellular animal life that took place around the beginning of the Cambrian Period. It resulted in the appearance of almost all modern animal phyla. See Note at Burgess Shale.Cambrian Explosion
A 1 million–12 million-year burst of evolutionary activity that occurred ±525 million years ago, during which the diverse life forms that now exist on the planet evolved. Before that time, most organisms were simple, composed of individual cells occasionally organized into colonies |