The sternal angleis the least likely part of a. the sternum to fracture in the elderly. b. occurs at the sternoclavicular joint. c. is a depression in the body of the sternum. d. occurs where the 1st rib attaches to the sternum. e. indicates the location of the joint between the costal cartilage of the 2nd rib and the sternum.

Sternal angle marks the joint between the sternum and the 2nd rib.

Option E.

Sternum is the breast bone which is a dorsi ventrally flattened bone present in thorax of human. It gives the support for the ribs where the ribs join. A sternum has three parts - Manubrium sterni, body of sternum and the xyphoid process.

The sternum has attachments of a total of 10 ribs and clavicle. The clavicle and the first rib joins in the Manubrium sterni, and the 3rd to 10th rib joins in the body of sternum. The 2nd rib joins in a facet which is partly in Manubrium sterni and partly in body of sternum. This place id also called the sternal angle. So the sternal angle marks the joint of 2nd rib to sternum.

yes, because even though a theory has a  lot of evidence to support it, it is not always true