← evolution quiz 2/18/11 Export Options Alphabetize Word-Def Delimiter Tab Comma Custom Def-Word Delimiter New Line Semicolon Custom Data Copy and paste the text below. It is read-only. Select All Fossil The preserved remains or traces of an organism that lived in the past http://farm1.staticflickr.com/6/11207971_03bf394b48.jpg Petrification the process of turning some plant material into stone by infiltration with water carrying mineral particles without changing the original shape http://farm4.staticflickr.com/3590/3562366834_2182213cd0.jpg Mold a fossil formed when an organism buried in sediment dissolves, leaving a hollow area http://farm3.staticflickr.com/2185/2261981184_4e8c38cba4.jpg 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 http://farm3.staticflickr.com/2723/4177602386_9343fb25ba.jpg Imprints impressions left by an organism http://farm3.staticflickr.com/2288/2360244456_67987aa2f5.jpg Tar Pits formed when a dark sticky form of oil seeps up from underground causing animals to get stuck. http://farm6.staticflickr.com/5046/5301040950_d9cd069576.jpg Tetrapod A vertebrate possessing two pairs of limbs, such as amphibians, reptiles, birds, and mammals. http://farm3.staticflickr.com/2047/2010691027_a3bac7b92d.jpg Paleontologist Scientists who study fossils http://farm1.staticflickr.com/198/551233249_f76b4a1091.jpg Trace Fossils any indirect evidence of life preserved as an impression in rock; trails, footprints, tracks, burrows, and bite marks http://farm4.staticflickr.com/3014/3048573036_1828634d48.jpg Evolved developed and changed over a long period of time http://farm4.staticflickr.com/3487/3191664147_689377427c.jpg Bipedal having two feet http://farm3.staticflickr.com/2744/4535503924_0d6a23139b.jpg Geologic time scale scale used by paleontologists to represent evolutionary time, Earth's history organized into four eras: Precambrian, Paleozoic, Mesozoic, and Cenozoic http://farm4.staticflickr.com/3498/3296535795_53fdfd082a.jpg 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 http://farm4.staticflickr.com/3437/4013336029_98e30aca63.jpg Lead a soft heavy toxic malleable metallic element Pentadactyl A being with 5 fingers on each hand and 5 toes on each foot http://farm1.staticflickr.com/47/149580816_a956e46245.jpg Homologous structures Structures in different species that are similar because of common ancestry.