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Eras of Earth’s History - Woodland Park School District

Eras of Earth’s History 1. Until the , only one-celled organisms lived on land, but during this period, plants became abundant. 2. At the start of the , many organisms evolved with hard parts including shells and outer skeletons. 3. During the animals began to spread widely on land. 4. At the end of the , most species of life on Earth died. 5.