منابع مشابه
Mob culture unravelled
One of the most intriguing issues in animal behaviour is that of altruism, particularly between unrelated individuals. For if such altruism is not reciprocated, biologists believe that it would not be able to persist as cheats would win out. So when does it pay to help others? One puzzling case is that of prey mobbing potential predators. Members of many species of small birds will mob a potent...
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Ulcers are common in the oral cavity. A wide spectrum of disorders can give rise to oral ulcers which may range from a local minor trauma to a significant local disease such as a malignancy or any other systemic illness. Early detection and prevention can have a potential impact on the overall incidence, morbidity, and mortality from oral cancers. However the clinical features may sometimes be ...
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ژورنال
عنوان ژورنال: Nature
سال: 1981
ISSN: 0028-0836,1476-4687
DOI: 10.1038/290803a0