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.
How did the Cambrian explosion of life change the nature of the living world? Numerous filter/deposit feeders and large, mobile predators complicated the world food web, many defensive structures and behaviors were favored in natural selection due to propogating carnivores