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Evolution

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Fossil
The preserved remains or traces of an organism that lived in the past
Petrification
gradual change of the original substances of an organism dissolve and are replaced by minerals from the water (turned to stone)
Mold
a type of fossil formed when a shell or other hard part of an organism dissolves, leaving an empty space in the shape of the part
cast
A type of fossil that forms when a mold becomes filled in with minerals that then harden.
Amber
hardened tree sap
imprints
Thin object falls into sediment can leave an imprint when sediment hardens.
tar pit
Formed when a dark sticky form of oil seep up from underground causing animals to get stuck
trace fossil
a type of fossil that provides evidence of the activities of ancient organisms
tetrapod
a vertebrate animal having four feet or legs or leglike appendages
paleontologist
scientist who studies fossils
evolved
to develop gradually by process of growth and change
bipedal
term used to refer to two-footed locomotion
geologic time scale
scale used by paleontologists to represent evolutionary time
radioactive dating
measurement of the amount of radioactive material (usually carbon 14) that an object contains
uranium
a heavy toxic silvery-white radioactive metallic element
lead
The metal created from aged uranium

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