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Radio metric dating is finding the absolute age of a sample by determining the relative percentages of a radioactive parent isotope and a stable daughter isotope.

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extinction is when all of the members of a species have died

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Adaptation is an inherited trait that helps an organism survive and reproduce in its environment .

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Variations are a species of natural differences.

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Evolution refers to the process in which populations gradually change over time .

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Artificial Selection shows that traits can change and can spread through populations.

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Absolute dating is determining the actual age of an event or object in years.

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any method of determining the age of earth materials or objects of organic origin based on measurement of either short-lived radioactive elements or the amount of a long-lived radioactive element plus its decay product.

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Half-Life is the time needed for half of a sample of a radioactive substance to undergo radioactive decay to form daughter isotopes.Half life is always given in units of time.

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Natural Selection is the process by which organisms that inherit advantageous traits tend to reproduce more successfully than other organisms do.

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unconformity is the process of geologic record that is made when rock layers are eroded or when sediment is not deposited for a long period of time.

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uniformitarianism is the geologic process that happened in the past can be explained by current geologic processes.

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superposition is the principle that states that younger rocks lie above older rocks if the layers have not been disturbed.

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Geologic column is an ordered arrangement of rock layers based on the relative ages of the rocks, oldest rock is at the bottom.

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Relative dating is determining whether an object is older or younger than other objects.

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ice core is a long cylinder of ice

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Climate is an area that describes the weathers condition in the area over a long period of time.

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The fossil record provides evidence about the order in which species have existed through time, and how they have changed over time.

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A trace fossil is a fossilized structure that formed in sedimentary rock by animal activity.

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A fossil is a trace or remains of an organism that long ago.