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Typically the queen honeybee is mother to all the bees in a hive; after mating with several male drones from other colonies, she lays fertilized eggs that develop into all-female worker bees and lays unfertilized eggs that become all-male drones. When a queen dies, workers often lay unfertilized eggs that hatch into drones. Yet workers rarely reproduce while a queen reigns. According to natural selection theory, a worker would enhance her fitnessor ability to propagate her genesby hatching her own eggs in addition to or in place of the queens. But a typical workers fitness would be diminished if other workers sons, who have less genetic material in common with the worker, supplanted the queens sons . Researchers, testing the hypothesis that workers usually somehow block each others attempts to reproduce, put unfertilized eggs laid by workers and by the queen into a hive. Other workers quickly devoured the workers eggs while leaving the queens eggs alone. 17. The author refers to the experiment described in lines 16-19 in order to explain how worker bees are prevented from mating with drones explain how worker bees hatch and nurture the queens young demonstrate the universality of natural selection show that worker bees are capable of thwarting each others attempts to reproduce provide a model of daily life in a typical honeybee hive | 
