Final answer:
Cosmetic intervention typically refers to procedures that aim to enhance appearance, such as breast reconstruction post-cancer treatment and procedures to increase breast firmness. A breast biopsy and breast reduction for back pain, while possibly affecting appearance, are primarily for medical diagnosis and therapeutic relief.
Step-by-step explanation:
A cosmetic intervention refers to any medical procedure performed to alter or enhance the physical appearance of a person for non-medical reasons. In the context of the question, reconstructive procedures, such as breast reconstruction after treatment for breast cancer and surgical reconstruction of the breast to increase its firmness, can be considered cosmetic interventions. However, a breast biopsy to check a suspicious lesion is not typically seen as a cosmetic intervention, as it is a diagnostic procedure to determine the presence of cancer, and a breast reduction to relieve back pain, while it may improve the appearance, is primarily performed for therapeutic, non-cosmetic reasons to alleviate health issues.