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Life Science 4

Evolution and genetic variation

Adaptation a characteristic that helps an organism survive in its environment
Evolution the process by which populations accumulate inherited changes over time
Fossil solidified remains or imprints of a once living organism
Fossil record a historical sequence of life indicated by fossils found in layers of the Earth's Crust
Vestigial Structure the remnant of a once useful anatomical structure
trait a distinguishing quality that can be passed from one generation to another
Natural selection the process by which organisms with favorable traits survive and reproduce at a higher rate than those without that trait;"survival of the fittest"
Variation differences that occur naturally in individuals and may affect their ability to survive, particularly when there is a change in the environment
Relative dating determining whether an event or object, such as a fossil, is older or younger than other events or objects
absolute dating determining the age of an object or event in years, usually by measuring the amount of unstable atoms in the sample
geologic time scale the division of the Earth's history into distinct intervals of time
extinct describes a species of organisms that has died out completely
Created by: wftate