Module 2 Case - Trident University ECOL100 Module 2 Case...

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********* Trident University ECOL100 Module 2 Case February 19, 2016
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Case Part I: Geologic History of Earth 1. When you clicked on the “bookmarks,” which events were listed and in what order (there were six)? Formation of the Earth and Moon, Earliest Life, Early Land Plants, Largest Mass Extinction, Dinosaur Extinction, and “Lucy” Early Hominid. 2. In the Geologic Time Scale section, images of which organisms are included in the Archaean time period? Archean means original or ancient. This is a time when the first single-celled organisms, like bacteria, began to evolve. Stromatolite (cross-section), Cyanoobacteria. 3. Which three periods of time are described as “Eras”? List the representative organisms included in the photos that appear when you click on each Era. The Phanerozoic Eon encompasses the period of abundant, complex life on Earth. It began with the start of the Cambrian period, 544 million years ago, when most of the major groups of animals first appear in the fossil record, and continues through today. Cenozoic means "recent life." Mammals, birds, flowering plants, and the ray-finned fishes all became more abundant during this time. Mesozoic means "middle life." Dinosaurs, cycads, and ferns were abundant during the Mesozoic. Paleozoic means "ancient life." Many animals of today originated then (during the Cambrian), like certain corals and brachiopods. Some like relatives of the sponge and trilobites originated then, but later went extinct. 4. How many mass extinctions are listed? What caused each, and how many species are estimated to have perished?
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While researching the Natural History Museum link that was provided I found 5 mass extinctions Ordovician, Devonian, Permian, Triassic, and Cretaceous periods. The
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