Part one of term paper
During a lot of things happened both geologically and biologically. The Cambrian Period was the first period of the Paleozoic Era, it lasted from 570 million years ago to 500 million years ago, 70 million years. It¹s very important because it corresponds with the firs t appearance of abundant fossils especially Trilobites, which characte ...

Part two of term paper
... Arabia, Madagascar, India, Australia, and Antarctica. Large shelled organisms first emerged during the Cambrian. Also Earth¹s atmosphere contained the same amount of oxygen as it does now, enough to sustain the metabolic rate of a complex organism. Running down the middle of the North American continent was a large inland sea called the Saulk sea. Inhabiting this sea, and the other seas of the primitive world, were Trilobites and Brachiopods . Trilobites were three - lobed ...