Образуйте от слова SCIENCE однокоренное слово так, чтобы оно грамматически и лексически соответствовало содержанию текста.
The main routes connect Europe and Africa, Europe and South-Eastern Asia and Australia, North and South America. How do we know about these routes? ______ study birds. They catch birds, place small bands with numbers on the birds’ legs and then let the birds fly away. Some of these banded birds are caught again. The band tells about the route.
Источник: «Сдам ГИА», задание № 279.