Final answer:
The male breast is primarily composed of adipose tissue, which is a form of connective tissue made up of fat-storage cells called adipocytes.
Step-by-step explanation:
The male breast is made of mostly adipose tissue. Adipose tissue is a type of connective tissue that is composed mainly of fat-storage cells called adipocytes. While the breasts are not directly involved in reproduction, they play a reproductive role as mammary glands that can produce milk to feed an infant, crucial after birth. However, the male breast does not generally produce milk, and the tissue is mainly adipose, aiding in energy storage and providing some protection. Each breast contains lobules where milk would be produced in females, but in males, these are typically not developed.