[Solved] What are the inward extensions of the sarcolemma into the muscle cell called? What function do these extensions serve? Nonbreeding: Refers to periods or conditions under which an organism does not engage in reproductive activities, often influenced by environmental factors, life history traits, and physiological status. Sterile Workers: Individuals, particularly in insect colonies like bees, ants, and termites, that cannot reproduce but perform tasks for the colony. Eusocial: Characterizing a high level of social organization in animals, where there is cooperative brood care, reproductive division of labor, and overlapping generations. Naked Mole Rats: Small, burrowing rodents known for their eusocial structure, lack of pain sensation in their skin, and resistance to cancer.