<span>Sternum is not a major muscle in the human body. Sternum is t</span>he long flat bone in the upper middle of the front of the chest. It is also called a Breastbone. Sternum <span>the </span>sternum<span> helps protect the internal thoracic viscera - such as the heart, lungs and oesophagus</span>
Answer:
D. they do not have stems, roots and leaves
