The thymus<span> serves a vital </span>role<span> is a training and development of T-lymphocytes</span>
It is referred as <span>zone of proximal development. The zone of proximal development enables a person to distinguish what he or she is capable of with help towards others and without it. It is somehow related to the given sentence above where it shows how children can do on their own and with the help of another person.</span>
B.Reporting additional cash found in the cash register
