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14 Cards in this Set
- Front
- Back
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extinction |
The death or complete disappearance of all the members of a species |
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fossil |
The preserved remains or traces of an organism that lived in the distant past |
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geologic time scale |
A timeline covering millions of years and showing the major eras of earth’s distant past |
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mass extinction |
The extinction of a huge number of species at about the same time |
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homologous structures |
Structures that are similar in different species |
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natural selection |
The process by which the organisms that are best adapted to their environments survive and reproduce Examples: peppered moth, finches, tortoises |
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selective breeding |
Human selection for reproduction of plants and animals with desirable traits Examples: dogs, horses, cattle |
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Precambrian Era |
4,500-543 million years ago, bacteria and fungi |
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Paleozoic Era |
543-248 million years ago, early fish, early reptiles, amphibians |
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Mesozoic Era |
248-65 million years ago, dinosaurs, flowering plants, reptiles |
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Cenozoic |
65 million years ago, primates, humans |
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Amber Fossil |
insects or small creatures get stuck in sap that hardens over time |
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Trace Fossil |
evidence left by an organism rather than remains |
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Fossils Reveal |
how organism changed, species extinction, record of Earth’s living things |
