Collection of quotes about the Cambrian explosion

This post is a collection of quotes about the Cambrian explosion. There are 2 quotes listed below. License: CC BY-SA 3.0

1."The Cambrian explosion... refers to an interval of time approximately 538.8 million years ago in the Cambrian Period when practically all major animal phyla started appearing in the fossil record." (Wikipedia: Cambrian explosion, 11.11.22 UTC 02:39)

2. "Before early Cambrian diversification, most organisms were relatively simple, composed of individual cells, or small multicellular organisms, occasionally organized into colonies." (Wikipedia: Cambrian explosion, 11.11.22 UTC 02:39)