Which list correctly represents the main sites of hematopoiesis in adults?

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In adults, hematopoiesis occurs mainly in red bone marrow located in bones of the axial skeleton and at the ends of certain long bones. Flat bones of the axial skeleton—ribs, sternum, vertebrae, pelvis, and skull—retain active red marrow and continuously produce blood cells. The proximal ends of long bones, especially the humerus and femur, also harbor red marrow and contribute to ongoing hematopoiesis. The scapula can contain red marrow as well, fitting into this distribution. This pattern emphasizes that blood formation is centered in the central skeleton and at the ends of long bones rather than in the shafts of long bones or in smaller, non-major bones. That’s why the list including ribs, sternum, skull, vertebrae, pelvis, scapula, and the proximal ends of long bones best represents the main sites of hematopoiesis in adults.