Final answer:
Honey bees and other eusocial insects are considered Darwinian puzzles because they have a high level of genetic relatedness. The workers indirectly contribute to the survival of the species by assisting their closely related queen in producing offspring. This behavior is an example of kin selection.
Step-by-step explanation:
Honey bees and other eusocial insects are considered Darwinian puzzles because they have a high level of genetic relatedness. This means that the worker bees share a large amount of genetic material with their queen and siblings. While the workers do not reproduce themselves, they indirectly contribute to the survival of the species by helping their closely related queen produce offspring and pass on their shared genes. This behavior is an example of kin selection, where individuals lower their own fitness to enhance the reproductive fitness of relatives.