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		 level n°  | 
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		1 | Ecosystem, ecology, in situ observations, biocoenoses | 
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		2 | behavior, controlled semi-closed biotopes, groups | 
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		3 | habitat compatibility, organism, ??? exist ? | 
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		4 | physiology, individual response, laboratory, experiment (e.g., immune challenges) | 
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		5 | population genetics, |