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Bio: Chapter 22

TermDefinition
Evolution Descent with modifications
Strata Superimposed layers of rock
Paleontology Study of fossils largely developed by French scientist Georges Cuvier
Catastrophism The principle that events in the past occurred suddenly and were caused by mechanics different from those operating in the present.
Uniformitarianism Mechanics of change are constant over time.
Adaptations Characteristics of organisms that enhance their survival and reproduction in specific environments.
Natural Selection A process in which individuals with certain inherited traits leave more offspring than individuals with other traits.
Artificial Selection Humans have modified other species over many generations by selecting and breeding individuals that possess desired traits.
Homology Similarity resulting from common ancestry.
Homologous Structures Structures in different species that are similar because of common ancestry.
Vestigial Structures Remnants of features that served important functions in the organisms' ancestors but no longer serve a purpose.
Evolutionary Tree Diagram that reflects evolutionary relationships among groups or organisms.
Convergent Evolution The independent evolution of similar features in different lineages.
Analogous Structures Structures that have similar characteristics because of convergent evolution not homology.
Biogeography The geographic distribution of species.
Continental Drift The slow movement of Earth's continents over time.
Endemic Animals and plants on islands are usually endemic which means they are not found anywhere else in the world.
Created by: Gianna B