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Side A ------ Side B
scientist who studies fossils.
  ------ paleontologist
information about past life, including the structure of organisms, what they ate, what ate them, in what environment they lived, and the order in which they lived.  ------ fossil record
term used to refer to a species that has died out.  ------ extinct
method of determining the age of a fossil by comparing its placement with that of fossils in other layers of rock.  ------ relative dating
distinctive fossil used to compare the relative ages of fossils. ------ index fossil
length of time required for half of the radioactive atoms in a sample to decay. ------ half-life
technique in which scientists calculate the age of a sample based on the amount of remaining radioactive isotopes it contains.  ------ radioactive dating
scale used by paleotologists to represent evolutionary time.  ------ geologic time scale
one of several subdivisions of the time between the Precambrian and the present.  ------ era
unit of time into which eras are subdivided. ------ period
tiny bubble, formed of large organic molecules, that has some characteristics of a cell.  ------ proteinoid microsphere
microscopic fossil; ______ of single-celled prokaryotic organisms that resemble modern bacteria have been found in rocks more than 3.5 billion years old.  ------ microfossil
theory that eukaryotic cells formed from a symbiosis among several different prokaryotic organisms.  ------ endosymbiotic theory
event in which many types of living things become extinct at the same time.  ------ mass extinction
large-scale ecolutionary changes that take place over long periods of time.  ------ macroevolution
process by which a single species or small group of species evolves into several different forms that live in different ways; rapid growth in the diversity of a group of organisms.  ------ adaptive radiation
process by which unrelated organisms independently evolve similarities when adapting to similar environments.  ------ convergent evolution
process by which two species evolve in response to changes in each other. ------ coevolution
pattern of evolution in which long stable periods are interrupted by brief periods of more rapid change.  ------ punctuated equilibrium

Side A ------ Side B
scientist who studies fossils.
  ------ paleontologist
information about past life, including the structure of organisms, what they ate, what ate them, in what environment they lived, and the order in which they lived.  ------ fossil record
term used to refer to a species that has died out.  ------ extinct
method of determining the age of a fossil by comparing its placement with that of fossils in other layers of rock.  ------ relative dating
distinctive fossil used to compare the relative ages of fossils. ------ index fossil
length of time required for half of the radioactive atoms in a sample to decay. ------ half-life
technique in which scientists calculate the age of a sample based on the amount of remaining radioactive isotopes it contains.  ------ radioactive dating
scale used by paleotologists to represent evolutionary time.  ------ geologic time scale
one of several subdivisions of the time between the Precambrian and the present.  ------ era
unit of time into which eras are subdivided. ------ period
tiny bubble, formed of large organic molecules, that has some characteristics of a cell.  ------ proteinoid microsphere
microscopic fossil; ______ of single-celled prokaryotic organisms that resemble modern bacteria have been found in rocks more than 3.5 billion years old.  ------ microfossil
theory that eukaryotic cells formed from a symbiosis among several different prokaryotic organisms.  ------ endosymbiotic theory
event in which many types of living things become extinct at the same time.  ------ mass extinction
large-scale ecolutionary changes that take place over long periods of time.  ------ macroevolution
process by which a single species or small group of species evolves into several different forms that live in different ways; rapid growth in the diversity of a group of organisms.  ------ adaptive radiation
process by which unrelated organisms independently evolve similarities when adapting to similar environments.  ------ convergent evolution
process by which two species evolve in response to changes in each other. ------ coevolution
pattern of evolution in which long stable periods are interrupted by brief periods of more rapid change.  ------ punctuated equilibrium