545 490 434 410 354 298 251 205 141 65 2 How long have these organisms been living on Earth? cockroach nautilus magnolia dragonfly caddis fly shark lungfishmammal.
Science Olympiad Fossils Division B 2015 1- Event Overview.
The Cambrian Radiation How did we get so many animals so quickly?
The Early Paleozoic Fauna: Ordovician radiation of the Cambrian survivors EPSC233 Earth & Life History (Fall 2002)
Chapter 29- Comparing Invertebrates. I. Invertebrate Evolution A. Origin of the Invertebrates 1. Invertebrates fossils have been found to date between.
22.4 – Early Life on Earth
Life on Earth
