10.1 Early Ideas About Evolution & 10.2 Darwin's Observations

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Vocabulary Ch 10 Principles of Evolution Biology 2010 Holt McDougal

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

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