(B) The $Thymus$ gland is a primary lymphoid organ located near the heart. It is quite large at the time of birth but gradually shrinks in size as a p

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(B) The $Thymus$ gland is a primary lymphoid organ located near the heart. It is quite large at the time of birth but gradually shrinks in size as a person ages,a process known as involution. By adulthood,it is significantly reduced in size and replaced largely by adipose tissue.