-Hemopoiesis: Red bone marrow of ribs, sternum and centra of thoracic vertebrae (make red blood cells, white blood cells and platelets) breast bone (sternum) Located anteriorly and midsagitally in thoracic cage. Parts of the sternum -Manubrium (upper part) articulates with clavicle and first pair ribs through first costal cartilages
a formula unit is the symbolic representation of an ionic compound or network solid and a molecular formula is the symbolic representation of a molecular compound see the web links and related questions links for more information
unit. 1  a single thing or person. 2  any group of things or persons regarded as an entity: They formed a cohesive unit. 3  one of the individuals or groups that together constitute a whole; one of the parts or elements into which a whole may be divided or analyzed.