[单项选择]

What unusual or unique biological train led to the remarkable diversification and unchallenged success of the ants for ever 50 million years The answer appears to be that they were the first group of predatory ensocial insects that both lived and foraged primarily in the soil and in rotting vegetation on the ground. Eusocial refers to a form (5) of insect society characterized by specialization of tasks and cooperative care of the young; it is rare among insects. Richly organized colonies of the land made possible by eusociality enjoy several key advantages over solitary individuals. 　　　 Under most circumstances groups of workers arc better able to forage for food and defend the nest, because they can switch from individual to group response and back (10) again swiftly and according to need. When a food object or nest intruder is too large for one individual to handle, nestmates can be quickly assembled by alarm or recruitment 　　　 signals. Equally important is the fact that the e
A. one type of food consumption to another
B. one environment to another
C. a solitary task to a group task
D. a defensive to an offensive stance

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