Logan is a name with Irish origins. The meaning of the name Logan is from the hollow. Common nicknames for Logan include Loag and Lo. Famous Loganâs include athletes Logan Bailly, Logan Coutre, Logan Kensing, and Logan Mankins.
During the Cambrian explosion, the atmospheric oxygen levels increased by up to 10 percent, and prior to that time the living creatures roaming the Earth were typically small, simple and often single-celled.
The Cambrian explosion or Cambrian radiation was the event of approximately in the Cambrian period when most major animal phyla appeared in the fossil record. It resulted in the divergence of most modern metazoan phyla. The event was accompanied by major diversification of other organisms.