{"id":626,"date":"2018-01-18T19:49:31","date_gmt":"2018-01-18T19:49:31","guid":{"rendered":"https:\/\/courses.lumenlearning.com\/wm-nmbiology2\/chapter\/introduction-to-the-evolutionary-history-of-the-animal-kingdom\/"},"modified":"2024-04-26T18:25:34","modified_gmt":"2024-04-26T18:25:34","slug":"introduction-to-the-evolutionary-history-of-the-animal-kingdom","status":"publish","type":"chapter","link":"https:\/\/courses.lumenlearning.com\/wm-nmbiology2\/chapter\/introduction-to-the-evolutionary-history-of-the-animal-kingdom\/","title":{"raw":"Introduction to the Evolutionary History of the Animal Kingdom","rendered":"Introduction to the Evolutionary History of the Animal Kingdom"},"content":{"raw":"

What you'll learn to do: Discuss the evolutionary history of the animal kingdom<\/h2>\r\n[caption id=\"attachment_1754\" align=\"alignright\" width=\"250\"]\"The Figure 1. An artist\u2019s rendition depicts some organisms from the Cambrian period.[\/caption]\r\n\r\nMany questions regarding the origins and evolutionary history of the animal kingdom continue to be researched and debated, as new fossil and molecular evidence change prevailing theories. Some of these questions include the following: How long have animals existed on Earth? What were the earliest members of the animal kingdom, and what organism was their common ancestor? While animal diversity increased during the Cambrian period of the Paleozoic era, 530 million years ago, modern fossil evidence suggests that primitive animal species existed much earlier.","rendered":"

What you’ll learn to do: Discuss the evolutionary history of the animal kingdom<\/h2>\n
\"The<\/p>\n

Figure 1. An artist\u2019s rendition depicts some organisms from the Cambrian period.<\/p>\n<\/div>\n

Many questions regarding the origins and evolutionary history of the animal kingdom continue to be researched and debated, as new fossil and molecular evidence change prevailing theories. Some of these questions include the following: How long have animals existed on Earth? What were the earliest members of the animal kingdom, and what organism was their common ancestor? While animal diversity increased during the Cambrian period of the Paleozoic era, 530 million years ago, modern fossil evidence suggests that primitive animal species existed much earlier.<\/p>\n\n\t\t\t

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Candela Citations<\/h3>\n\t\t\t\t\t
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