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chapter 4


species a group of similar organisims.
variation difference between individuals of the same species.
evolution the process of modern organisims have descended from ancient organisims.
fossil preserved remains or traces of an organisim that has died.
adaptation inherited behaivor or characteristic that helps an organisim survive.
sientific theory well tested explanationfor a wide range of observations.
mechanisim something takes place naturally.
natural selection individuals that are more adapted are more likely to survive.
competition the struggle among living for things nessesary.
mutation any change to the genetic material.
fitness how well it can survive.
sexual selection acts on the ability possible to get the best mate.
coevolution two species evolve in response to changes over time.
fossil record fossils we have discovered and learned.
embryo young organisim that develops from a fertilized egg.
homologous structures similar structures that are inherited from common ancestors.
extinct does not exist or will never visit earth again.
protien organic material made from carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur.
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