18 terms

evolution quiz 2/18/11

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Fossil
The preserved remains or traces of an organism that lived in the past
Petrification
the process of turning some plant material into stone by infiltration with water carrying mineral particles without changing the original shape
Mold
a fossil formed when an organism buried in sediment dissolves, leaving a hollow area
Cast
a type of body fossil that forms when crystals fill a mold or sediments wash into a mold and harden into rock
Amber
a hard yellowish to brownish translucent fossil resin
Imprints
impressions left by an organism
Tar Pits
formed when a dark sticky form of oil seeps up from underground causing animals to get stuck.
Tetrapod
A vertebrate possessing two pairs of limbs, such as amphibians, reptiles, birds, and mammals.
Paleontologist
Scientists who study fossils
Trace Fossils
any indirect evidence of life preserved as an impression in rock; trails, footprints, tracks, burrows, and bite marks
Evolved
developed and changed over a long period of time
Bipedal
having two feet
Geologic time scale
scale used by paleontologists to represent evolutionary time, Earth's history organized into four eras: Precambrian, Paleozoic, Mesozoic, and Cenozoic
Radioactive dating
a technique used to determine the actual age of a fossil on the basis of the amount of a radioactive element it contains
Uranium
a white, radioactive metallic chemical element that weighs more than any other element in nature
Lead
a soft heavy toxic malleable metallic element
Pentadactyl
A being with 5 fingers on each hand and 5 toes on each foot
Homologous structures
Structures in different species that are similar because of common ancestry.

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