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The abundant animals of this time were trilobites and burgess shales. It was the beginning of the race to survive and evolve.
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The abundant animals in this time were trilobites. Glaciation was non-existant as the carbon dioxide levels were seven times higher back then, than they are today.
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The dominant species during this time period were: trilobites, mollusks, giant sea scorpions, and the first relatives of spiders and centipedes on land.
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Gondwana dominated as a supercontinent; placoderms such as the dunkleosteus dominated with trilobites until the end of the Devonian that followed the extinction of placoderms and trilobites.
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The Carboniferous period was named after the massive amounts of coal, oil, and carbon dioxide was on the Earth at the time. The dominant creatures were giant insects, centipedes, arachnids, and everything in-between.
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Towards the end of this period would spell the greatest mass extinction in recorded history. 96% of all life went extinct during this time, and this was also the end of the Paleozoic Era.
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The beginning of the Mesozoic Era. Life took milions of years during this time to recover from the previous Permian extinction. Pangea takes it's place as the most famous supercontinent to date.
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The first birds started to appear. The Earth was dominated by massive reptiles, and most life was hostile.
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Most of the large dinosaurs died at the end of this period during the K-Pg Event. Tons of bird species flourished during this time, and the smaller creatures that survived were the mammals that remained underground or in secluded areas.
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Earliest Placental mammals, modern mammals, and large mammals. This is also the longest-known period of all previous eras.
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Humans started to appear, as well as large carnivores. The evolution of intelligence had begun.