What defines a eusocial organism?

A eusocial organism is defined by a specific social structure in which there is a division of labor among its members, typically involving reproductive and non-reproductive roles. The defining characteristic is that a single female or a specific caste is responsible for producing offspring, while the non-reproductive individuals contribute to the care of these young and the maintenance of the colony. This cooperative breeding and social organization enhance the survival of the offspring and the colony as a whole.

In a eusocial system, the highly organized social structure allows for efficient resource use, increased protection from predators, and improved care for developing young. This specialization means that not every individual reproduces; rather, the reproductive individual(s) focus on producing the next generation, while others support the colony's overall functions. Thus, the correct choice highlights this crucial aspect of eusociality, showcasing the intricate relationships and roles within such organisms.