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13 Cards in this Set
- Front
- Back
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Variation |
The genetic differences within a species. - often observable |
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Diversity |
The difference between species. - always observable |
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Species |
Organisms that are structurally similar. - have a common ancestor. - can produce fertile offspring |
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Fossil |
Some remain or trace of something that lived along time ago. Normally found in sedimentary rock. |
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Four types of fossils |
Mold - when you have a in print of a animal cast - form when sediment enter a mold and harden imprints - consist of footprints tracks or tunnels made by animals or living organism petrifaction - occurs when the skeletal remains of an animal or cell walls of a plant are gradually replaced by minerals |
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Law of superposition |
The deeper the stratum the older it is |
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Absolute radiometric |
Based upon the steady rate at which a radioactive element decays |
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Homologous structures |
Parts of different organisms that have similar structures |
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Vestigial structure |
Serve no useful function but are similar to functional organs in other organisms. |
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Theory |
Describes and explains a process Answers the question of how it works |
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law |
Describes and explains a pattern Answer the question what it does |
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Relative dating |
Fossil dated relatively to layers of rock and other fossils embedded in rock using the law of superposition |
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Analogous structures |
Are body parts of different organisms that have similar function but are different in structure and origins |
