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16 Cards in this Set
- Front
- Back
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extinction |
The death or complete disappearance of all members of a species. |
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fossil |
The preserved remains or traces of an organism that lived in the distance 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. |
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selective breeding |
Practice of choosing plants and animals with desirable traits to reproduce. |
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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 |
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Natural Selection (example) |
peppered moth, finches, tortoises |
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Selective Breeding (example) |
dogs, horses, cattle |
