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20 Cards in this Set
- Front
- Back
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Species
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a group of similar organism that can mate and produce offspring.
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Darwin's Therory of Evolution
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species gradually change over many generations and become better adapted to the new condition of their environment
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Theory
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a well- tested concept that explains a wide range of observations
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Darwins book
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The Origin Of Species
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Natural selection
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Process by which individuals that are better adapted to their environment are more likely to survive and reproduce than other memebers of the species
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Over Production
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more offspring are produced than survive little parental involvement, not enough resources, won't all make it to adulthood
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Competition
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need to make use of limited resources, not always a phyisical "fight", species may trick one another, can also be displays.
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Reproduction
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variations that occur during fertilization can help or hurt an organism trying to survive, survivors can adapt and pass on their beneficial traits to their offspring
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Speciation
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over TIME adaptions are passed down through a species, if isolated a new species may evolve from a common ancestor.
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Survivial of the fittest:
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the survivors have adapted to their environment, variations: differences between individuals and species may be due to mutation and genetic recombination, small changes can accumulate ao individuals may be different from their ancestors
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Fossil
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remains or taces of organisms that lived long ago. they are the best evidence of evolution
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Relative dating
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the fossils in the bottom rock layers are older than the ones towards the top
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Radioactive dating
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provides specific evidence for the age of fossils
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Vestigial structures
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left overs that are usually reduced in size and really serve no function
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phylogenetics
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the study of the evolutionary relatedness among variations groups of organisms
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Macroevolution
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big change over a long time
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microevoltion
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smaller changes in a smater period of time
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Mass Extinction
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Many types of living things dissapear at the same time
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Adaptive Radioation
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when new species live in different ways than the original species did
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Coevolution
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when two species envolve in responce to changes in each other.
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