The "Cambrian explosion" refers to a. the creation of Earth. b. the development of the first true cell. c. the origination of life. d. the origination of all major phyla of animals. e. the mass extinction of dinosaurs.
The "Cambrian Explosion" refers to the sudden appearance in the fossil record of complex animals with mineralized skeletal remains. It may represent the most important evolutionary event in the history of life on Earth.
