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The Precambrian Time was from 4.6 billion years ago to 541 million years ago. The word "Precambrian," means "before the Cambrian period". Since there wasn't enough oxygen for sustaining life, there weren't any plants since plants need oxygen. Even thought there weren't plants in that time, there were sea animals. The ocean had animals like, sponges, sea anemones, jellyfish, corals, flatworms, annelids, and cnidarians. Many volcanoes were erupting, there was continental crust forming, and sedimentation. Bacterias like, invertabrates, algae, fungi, and archae lived during this time, and still do today.

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The Paleozoic Era was 541 million das ago. It got its name from the Greek word for "Ancient Life". Some plants that lived in that era were cycads, glossopteris, primitive conifers, and ferns. Some animals that lived in the Paleozoic Era were trilobites, fish, and sea sponges. The creation of life and the earth happened in the Paleozoic Era.

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The Mesozoic Era was an era from 250 mya to 66 mya. Mesozoic means "middle animal". In the beginning of the Mesozoic era there were a lot of ferns, cycads and ginkgophytes. Dinosaurs, birds and reptiles were animals in the time period. One big thing that happened was the dinosaurs went extinct.

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- The Time it Happened?
Happened 65.5 Million Years Ago
- The Meaning Behind the Name of the Era?
Cenozoic means recent life.
- What Kinds of Plants Existed During this Time?
The plants that existed during this time were pines, mosses, oaks, and grasses.
- What Kind of Animals Existed During this Time?
The animals that existed during this time were rodents, small horses such as Hyracotherium which are also common with rhinoceroses and elephants.
- What Significant Events Happened During this time?
Mass extinction, the rise of mammals, climate changes, and the movement of continents into their new positions.