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Pelozoic Era

By: Becca, Vika, Lavanya, Olivia M., and So Hee

Student Shelton

on 21 November 2013

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Transcript of Pelozoic Era

In the Paleozoic Era, life began in the seas. After the Cambrian Period came the 45-million-year Ordovician Period, which is known for having nearly alll of the fossils for marine invertebrates. Probably the most famous of those invertebrates was the trilobite, an armored arthropod that scuttled around the seafloor for about 270 million years before going extinct.

Paleozoic Era
After the Ordovician Period came the Silurian Period ,which lasted 27 million years,which saw the spread of jawless fish throughout the seas. Mollusks and corals thrived in the as well oceans, but the big news was what was happening on land: the first undisputed evidence of terrestrial life.
This was the time when plants evolved, though they most likely did not yet have leaves or the vascular tissue that allows modern plants to siphon up water and nutrients. Those developments would appear in the Devonian Period, the next geological period of the Paleozoic Time. Ferns appeared, as did the first trees. At the same time, the first vertebrates appeared on land. land. These vertebrates were called tetrapods, and they were widely diverse: Their appearance ranged from lizardlike to snakelike, and their size ranged from 4 inches (10 cm) long to 16 feet (5 meters) long, according to a study released in 2009 in the Journal of Anatomy.

As the tetrapods took over, they had other company: The Devonian Period saw the rise of the first land-living arthropods, including the earliest ancestors of spiders
Becca, Olivia M., Vika, Lavanya, and So Hee
A Trilobite
The Carboniferous period takes its name from large underground coal deposits that date to it. In the U.S., scientists divide the Carboniferous into two parts: the earlier Mississipian and the later Pennsylvanian. During the Mississipian, North America, northern Europe, and Greenland, remained separate from the larger, cooler supercontinent of Gondwana to the south. To the east, parts of Asia, including China, were surrounded by warm oceans. While Gondwana became progressively colder as it began another poleward migration, the tropical landmasses remained wet and humid
The Permian period, which ended in the largest mass extinction the Earth has ever known, began about 300 million years ago. The emerging continent of Pangaea presented severe extremes of climate and environment due to its vast size. The south was cold and arid, with much of the region frozen under ice caps. Northern areas suffered increasingly from intense heat and great seasonal fluctuations between wet and dry conditions. The lush swamp forests of the Carboniferous were gradually replaced by conifers, seed ferns, and other drought-resistant plants. Early reptiles were well placed to capitalize on the new environment. Shielded by their thicker, moisture resistant skins, they moved in where amphibians had previously been dominant. Over time, they became ideally suited to the desert-type habitats where they live today.
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