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This time period is known as the Cambrian explosion .

This time period is known as the Cambrian explosion . It led to a huge diversity of animal species. Jawless fish similar to the modern day hag fish. 12.5 Radiation of Multicellular Life. How did single-celled organisms come to produce such great biodiversity that we see today?.

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This time period is known as the Cambrian explosion .

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  1. This time period is known as the Cambrian explosion. • It led to a huge diversity of animal species. • Jawless fish similar to the modern day hag fish.

  2. 12.5 Radiation of Multicellular Life How did single-celled organisms come to produce such great biodiversity that we see today?

  3. KEY CONCEPT Multicellular life evolved in distinct phases.

  4. Life moved onto land during the Paleozoic Era. • Multicellular organisms first appeared during the Paleozoic era. • The era began 544 million years ago and ended 248 million years ago. Multicellular Life

  5. Members of every animal group appeared with a few million years of the first multicellular, colonial life forms • Multicellular animals radiated, the first vertebrates appeared, and plants moved onto land

  6. This time period is known as the Cambrian explosion. It led to a huge diversity of animal Species. Jawless fish, similar to the modern day hagfish evolved during this Period.

  7. Trilobite: index fossil of the Cambrian Period • A mass extinction at the end of the Cambrian Period led to 90% of the marine animal species and 70% of land animal species going extinct

  8. Life moved onto land in the middle of the Paleozoic era. • Four-legged amphibians became more common • Most of the coal in the U.S. formed in the Carboniferous Period.

  9. Reptiles radiated during the Mesozoic era. • The Mesozoic era is known as the Age of Reptiles. • It began 248 million years ago and ended 65 million years ago. • Early mammals and flowering plants developed late in the Mesozoic Era

  10. Life slowly took off in the Triassic Period. • Earliest crocodiles and dinosaurs, and the earliest ancestors of mammals appeared.

  11. The Jurassic Period saw the rise of large marine predatory reptiles such as Ichthyosaurs • Sharks and bony fishes

  12. The Cretaceous Period is associated with the peak of dinosaur diversity. • Rise of the first marsupials. • Feathered dinosaurs. • This is Archaeopteryx

  13. A mass extinction by a meteorite impact ended the Mesozoic Era and made the dinosaurs as well as many other life forms go extinct.

  14. Mammals radiated during the Cenozoic era. • The Cenozoic era began 65 million years ago and continues today. • Placental mammals and monotremes evolved and diversified. Birds and flowering plants became common. • Anatomically modern humans appeared late in the era.

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