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Certain preparations contain killed or weakened live biological agents that, upon injection into our body, protect the body against those pathogens. what are these preparations called? .
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Development of new communities in disturbed environments, such as a burned or a clear cut forest, is called
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Which of the following would involve looking at different structures of organisms and comparing how similar they are? a. vestigial structuresb. radiometric datingc. homologous structures
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Certain preparations contain killed or weakened live biological agents that, upon injection into our...
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