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17 Cards in this Set
- Front
- Back
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Adaptation
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A characteristic thata helps organisms survive in its environment.
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species
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A group of organisms that are closely related and can mate to produce offspring.
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Evolution
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The process in which populations gradually change over time
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Fossil
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the trace or remains of an organism that lived long ago, most commenly preserved in sedimentary rock
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Fossil record
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a historical sequence of life indicated by fossils found in layers of the earths crust.
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Trait
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A genetically determined characteristic
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Selective Breeding
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The human practice of breeding animals or plants that have certain desires.
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natural selection
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a theory to expalin the mechamism of evolution
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generation time
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The period between the birth of one generation and the next generation.
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Speciation
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the formation of new species as a result of evolution.
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Fossil
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Relative Dating
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Estimating the age of rocks and fossils
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Absolute Dating
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a method that measures the age of fossils or rocks in years.
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Precambrian TIme
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the period in the geological time scale from the formation of earth to the beginning of the Palezoic era, from about 4.6 billion years to 542 million years ago
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Extinct
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describes a species that has died out completely
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Plate Tectonics
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the theory that explains how large peices of the Earth's outermost layer called tectonic plates move and change shape.
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