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According adaptation adult ancestral animals appear appendages assimilating atrophy bear became become body branches called cause ceased cells changes characters completely condition connection consists continue corporations course Court custom degeneration degenerative disappeared established evolution examples exhibit existence fact female five flowers formed frequently function further importance individual instance institutions kind lack land lateral leaf leaves less limbs living longer lost male marriage means mentioned modifications natural necessary normal nutrition occur organs original pairs passed persist persons plants possess present primitive produced progressive protection reappear recently reduced regarded remain represent result retracing roots rudimentary says separate shows side similar social societies sometimes species stages stamens stem structure successive third tion traces transformation useless usually various vertebrates vestiges whole young
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