Species During the Formation of Earth essays

Species During the Formation of Earth essays Earth has went through lots of changes ,in species, from there just being algi and eboli to there being massive dinosaurs. The earths time is set up in to different periods they are; the Cambrian period, Ordovician period, Silurian period,Devonianperiod,Carboniferous period, Permian period, Mesozoic Era, the Triassic period, Cretaceous period, and the Jurassic period. In all of these periods there is something different about wildlife The Cambrian is the first I want to talk about . It is called that because some of the first fossils were foung in Cambria. During this time every thing lived in water. There were large animals and small ones. Some of the animals include dprotozoa,profirera ,coelenterates, worms ,anthropods ,mollusks ,and echinoderms. These crustaceans were all invertebrates. All types of animals lived in the ocean from very large ones to very tiny ones. The next is the Ordovician period. It is named that because there were called the Ordovices.during this period animals began to appearlisuch as graptolites.also,larger animals like cephalopods,starfish,and scorpions. The Silurian period was also named after a group of people, the siluries.this was a short period but Sea lilies were getting bigger. Coral was also a very important thing.protazoans began to appear more,Radiolaria,and also the first milipede.also the first fish appears this is the first sign of vertebrates. Oceans were starting to dry up islands were forming. Plants were the first living thing to come out of water. The Devonian period comes from the town Devon. Fishes were starting to show up more and some were protected by a outer shell. Also cockroaches the only living thing that has not changed. The Carboniferous period has the first animals to put their head out of water. The first to come out of water were the flowers that purified the air then came land animals. Amphibians began to show up .they had many of enemies so they were ...