evolution quiz 2/18/11

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18 terms

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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