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The process of selecting organisms with desired traits to be parents of the next generation

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A gap in the geologic record that show where rock layer have been lost due to erosion.

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Fossil of widely distributed organisms that lived during geologically short period.

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An igneous rock layer formed when magma harden beneath earth surface

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An igneous rock layer formed when lava hardens on the surface of earth.

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The geological principle that states that in horizontal layer of sedimentary rock each layer is older than the layer above it and younger then the layer below it.

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The age of rock given as the number of years since the rock formed

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The age of a rock compared to the ages of other rocks

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A well-tested explanation for a wide range of observations or experimental results

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A group of similar organisms that are best adapted to their environment are most likely to survive and reproduce

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The process by which organism that are best adapted to their environment are most likely to survive and reproduce

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A genetically determined characteristic

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The study of heredity and the variation of inherited characteristics.

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Similar structure that related species have inherited from a common ancestor.

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Any driffence between individual of the Same species

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Physical features of an organism that help it to survive and succeed in its environment

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The process by which an organism or a species Chi gets its pattern of action to better suit it environment

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Internal systematic response to external stimuli in order to help an organism maintain homeostasis.

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A trait that increase an organism ‘s ability to survive and reproduce.

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Changes over time;the process by which modern organisms have descended from ancient organisms

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A record of the geologic events and life forms in earth history

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Term used to refer to a group of related organisms that has died out and have no living memeber.

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A type of fossil that provide evidence of the activities of ancient organism.

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A type of fossil consisting of an extremely thin coating of carbon on rock.

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A fossil in which minerals replace all or part of an organism

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A fossil that is a solid copy of an organism’s shape,formed when minerals sleep into mold.

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A type of fossil that is hollow area in sediment in shape of an organism or part of an organism

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The fossils in particular group of rocks that give information about how and when those rocks formed.

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The preserved remains or trace of an organism that lived in the past.