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11 terms

Life Over Time- Chapter 1

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Fossils
Remains of organisms preserved in the earth.
Relative Dating
One fossil is compared to another fossil.
Absolute Dating
Tells you the exact age of a fossil using radioactive elements.
Mass Extinction
When large numbers of species become extinct in a short time.
Evolution
When species change over time.
Natural Selection
Members of a species that are best suited to their environment survive and reproduce at a higher rate than other members of the species.
Variation
Within a species there are natural differences in traits.
Adaptation
Any inherited trait that gives an organism an advantage in its particular environment.
Speciation
The evolution of new species from existing species.
Ancestor
An early form of an organism from which late forms descend.
Vestigial Organ
Physical structures that were fully developed and functional in an ancestral group of organisms, but are reduced and unused in later species.