The Paleozoic Era lasted only 544 million years and has 6 periods. The names of the periods were Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian. During this time the animals that were found were snails, claims, and jaw-less fish that are shaped like a tooth. We know this because of the fossils found. The volcanic activity slowed down, but there are still few volcanic activities popping up, but not very often.During this time Earth is experiencing its first ice age.Near the end of the Ordovician new plants were forming on the top of Earth's surface, then forest and swamps would soon become one of Earth's habitats. Life forms were being created as well as being destroyed. The climate change that the youngEearth was going through changed so fast that most life forms could not adapt to the weather as fast as it was changing. The life form that died were many plants on the surface of the earth but the marine Biota, Tabulate, Rugose Corals, Blastoid Echinoderms, Graptolities, and Crinoids also died in many numbers. It is thought that the huge extinction was not only by climate, but also because of the moving of the continents.
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Trilobite
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jawless fish
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Arachinds
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cockroaches
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Amphinas
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reptiles
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moss
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fern
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tree
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flower
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dinomischus