21.   The extent to which guidelines have influenced social behaviour is difficult to assess.

22.   We noticed this benefit in discovering why conventionalism does worse in coordinating social behaviour than pragmatism.

23.   Nature publishes strong evidence for a gene that affects social behaviour.

24.   It examines in depth the similarities and differences in seasonal and diurnal habitat use, food habits and social behaviour.

25.   Other birds tend to adapt to specific habitats, both in physical structure as well as in social behaviour and habits.

26.   They were unaware of the norms or rituals of social behaviour.

27.   Both Vajpayee and Jassat called for changes in attitude and social behaviour to keep the disease at bay.

28.   Singapore will periodically survey cleanliness in public toilets to help measure its progress in improving social behaviour, Prime Minister Goh Chok Tong said in a speech released Monday.

29.   That raises intriguing questions about mating and other aspects of social behaviour.