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science 2
| Term | Definition |
|---|---|
| Geologic time scale | a record of the major events and diversity of life forms in Earth's history |
| Precambrian Era | The first Era in earths. Began with the creation of the Earth 4.6billion years ago. simple life forms, oceans form. no hard skeletons (jellyfish and sea-worms) |
| Paleozoic Era | Early land plants and invertebrates; then fish, arachnids. insects, and ferns. Later amphibians, and reptiles. mass extinction of the marine invertebrates at the end of the Era |
| Mesozoic Era | Retiles are the dominant animal, including dinosaurs. Small mammals and flowering plants appear at the end of the era. Mass extinction of dinosaurs at the end of the era |
| Cenozoic Era | Mammals are the dominant species Diversity of life increases. Flowering plants are most common. Modern humans appear near the end of the era |
| Mass extinction | a widespread and rapid decrease in the biodiversity on earth. an event identified as a sharp sharp in the Diversity and abundance of multicellular organisms |
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Neolowery
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