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Definition
| a change over a period of time |
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| bones and other traces of ancient organisms |
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| a combination of physical characteristics and behaviors that helped each organism catch food, withstand harsh conditions, or reproduce |
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| based on an organism’s ability to successfully pass on its genes to its offspring |
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| develop from similar tissues in the early developmental stages of the organisms |
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| structures that seemed to have little or no obvious purpose in the organism |
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| nature provided the variation and humans allowed only selected organisms to produce offspring. |
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| generation after generation, the struggle for existence selects the fittest individuals to survive in natural |
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| each living species has descended from other species over time |
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Definition
| changes in the structure of an organism’s DNA cause changes in the information carried in one or more of its genes |
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| a species is defined as a group of similar-looking organisms that can breed with one another and produce fertile offspring |
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| when members of species interbreed, they share genes with one another |
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| an allele can become more or less common in a population simply by chance |
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Definition
| the formation of a new species |
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| view that evolutionary change occurs slowly and steadily over long periods of time |
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| periods of evolution that proceeded relatively quickly |
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| fossil records show several instances of diversity occurring in a newly evolved species in a relatively short period of time |
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Definition
| unrelated species may independently evolve superficial similarities because of adaptations to similar environments |
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| structures which are similar in appearance and function but are developed from anatomically different parts |
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Definition
| the variety of all the organisms the genetic information they contain, and the biological communities in which they live |
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| consists of the variety of habitats, living communities, and ecological processes in the living world |
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| refers to the enormous variety of living organisms on Earth |
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| refers to the sum total of all the different forms of genetic information carried by all organisms living on Earth |
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| biological timekeepers that record how long ago living organisms shared a common ancestor |
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