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https://ucmp.berkeley.edu/cenozoic/cenozoic.php
https://www.livescience.com/40352-cenozoic-era.html
https://www.universetoday.com/47473/cenozoic-era/
https://www.britannica.com/science/Cenozoic-Era
https://www.nationalgeographic.com/science/prehistoric-world/neogene/

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North and South America had to attach to each other to become the Americas.
Birds outnumbered mammals 2 to 1.
The term 'cenozoic' comes from the Greek term for recent life.

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The major types of plants that lived in this era included pines, mosses, oaks, grasses, flowering plants, and edible crops such as potatoes, carrots, and tomatoes.

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Animals that lived during the Cenozoic era included rodents, small horses, rhinoceroses, elephants, dogs, cats, pigs, birds, flightless birds, early primates/humans, cattle, sheep, goats, antelopes, gazelle, humans, cave lions, sabre-toothed tigers, cave bears, giant deer, woolly rhinoceroses, and woolly mammoths.

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1. The continents split apart and moved to their places now during the Paleogene period, which created the oceans we travel today.
2. During the Pleistocene epoch, glaciers blanketed North America, going as far as New York, Kansas, Nebraska, and Oregon. As the glaciers melted, the Great Lakes came into existence.
3. During the Pliocene epoch, the mountain ranges, including the Himalayas, Rocky Mountains, and the Alps, were formed.

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The original climate of the Earth was a tropical feeling. However, in the Pleistocene epoch, an ice age occured around 2.1 millions years ago, which changed the climate to a frosty feeling. Then, the climate was different around the world, as some places were colder and hotter than others. The average temperature was hot, though.

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Throughout Paleogene:
The continents drifted apart which created vast oceans.
Paleogene/Paleocene:
The end of the dinosaur's extinction. Mammals and birds now dominate.
Neogene/Pliocene:
The mountain ranges are formed.
Quartenary/Pleistocene:
An ice age occurs. Glaciers blanket central North America, and formed the Great Lakes as they melt.

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The order of periods and their epochs goes:
Paleogene
- Paleocene
- Eocene
- Oligocene
Neogene
- Miocene
- Pliocene
Quartenary
- Pleistocene
- Holocene

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The Cenozoic era started 65 million years ago, and is still going today. The previous era, the Mesozoic era, was the era in which the dinosaurs went extinct, and it bled into the Cenozoic era as well.