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10.1 Early Ideas About Evolution & 10.2 Darwin's Observations

Vocabulary Ch 10 Principles of Evolution Biology 2010 Holt McDougal
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evolution
change in a species over time; process of biological change by which descendants come to differ from their ancestors
species
group of organisms so similar to one another that they can breed and produce fertile offspring
fossil
trace of an organism from the past
catastrophism
theory that states that natural disasters such as floods and volcanic eruptions shaped Earth's landforms and caused extinction of some species
gradualism
principle that states that the changes in landforms result from slow changes over a long period of time
uniformitarianism
theory that states that the geological processes that shape Earth are uniform through time
hybridization
the crossing of two different species that share common genes
variation
differences in physical traits of an individual from the group to which it belongs
adaptation
inherited trait that is selected for over time because it allows organisms to better survive in their environment