Which prefix refers to the immature state of an organism?

The prefix that refers to the immature state of an organism is "blast/o." In medical terminology, "blast" is used to denote a precursor or immature form of a cell or tissue, such as in terms like "osteoblast," which refers to an immature bone cell that is actively involved in the formation of bone. This prefix signifies the early developmental stages of various types of cells or tissues, indicating their role in growth and maturation processes within the body.

The other prefixes have different meanings: “blephar/o” pertains to the eyelid, “brachi/o” relates to the arm, and “bronch/o” refers to the bronchial tubes in the respiratory system. Each of these prefixes is connected to specific anatomical structures rather than indicating an immature state of an organism.