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18-various species migrated between continents across land bidges
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geological timescale
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22-trilobites appear 23- shelled brachiopods appear
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27- many early mammal become extinct , clams and snails flourish
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33- Vascular land plants and animals such as scorpions begin to evolve on land 24-euryptedis sea stars and coral become more extincts
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31- huge plants begin to develop early amphibians form 37- age of fishes fish that can breath out of the water and spend time on land form
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2- swamps and forest cover the land 26- first modern horses appear
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16- welcome to the word of the dinosaur enter the squirrel sized dinosaur and the first forest dwelling mammals appear 34-ichthyosaurs are living in the oceans .
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3- flying reptiles called pterosaurs are in the air now 13- whoa those dinos getting big dominated the land lizard hipped appear carnivores and herbivores have arrived
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5-first flowering plants appear 38- environmental change causes mass extinctions of sea invertibrates
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12- first primates appear 29- small rodents evolve
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17-flying squirrels whales and bats appear 25- world wide temperatures drop about 4 degrees celsius
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6- himalayas develop due to uplifting caused by the indian subcontinent and eurasian continents colliding 27- many early mammals become extinct clams and snails flourish
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32- antartic icecaps begin to form 36-mediterranean sea dries up and refills several ties due to tectonic forces dn dropping sea levels
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26- first modern horses appear 18-various species migrated between continents across land bridges
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20-species that did not evolve to survive extreme cold moved to warmer climate areas or became extinct ( dire wolf giant ground sloth 9- homosapien appeared are hunters
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19- the last glacial period ended and sea levels rose great lakes formed 28- modern humans developed agriculture and use tools made of bronze and iron
