In an experiment one group of deer mouse (Prymyscus leucopus) were enclosed in a big hall containing natural things like plants, hay, twigs, logs, etc. A second group of mice was kept in laboratory in cages without any exposure to natural environment. Then mice from each group were enclosed in a room with predatory owl. It was found that the mice that were exposed to natural habitat could escape the owl but the mice kept in cages could not. This is an example of ______.
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