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14 Cards in this Set
- Front
- Back
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fossil record
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information about past life
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relative dating
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the age of a fossil is determined by comparing its placement with that of fossils in other layers of rock.
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index fossil
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used to compare the relative ages of fossils
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half life
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the length of time required for half of the radioactive atoms in a sample to decay
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radioactive dating
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is the use of half lives to determine the age of a sample
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geologic time scale
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used to represent evolutionary time
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eras
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three periods of time between precambrian and present. they include: palezoic, mesozoic, and cenozoic.
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proteinoid microspheres
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tiny bubbles formed by large organic molecules
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endosymbiotic theory
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proposes that eukaryotic cells arose from living communities formed by prokaryotic organisms
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macroevolution
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large scale evolutionary changes that take place over lonf periods of time
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adaptive radiation
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studies of fossils show that a single species has evolved into several different forms that live in different ways
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convergent evolution
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unrelated organisms come to resemble one another
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co evolution
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two species evolve in respoce to changes in each other over time
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punctuated evolution
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pattern of long, stable periods interrupted by breif periods of more rapid changes
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