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(C) The thymus gland is a primary lymphoid organ that plays a crucial role in the development and maturation of $T$-lymphocytes,which are essential fo

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degeneration of thymus gland

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(C) The thymus gland is a primary lymphoid organ that plays a crucial role in the development and maturation of $T$-lymphocytes,which are essential for cell-mediated immunity.As a person ages,the thymus gland undergoes a process called involution,where it gradually shrinks and is replaced by adipose tissue.This degeneration of the thymus gland leads to a reduced production and maturation of $T$-cells,which significantly weakens the immune system in elderly individuals.

The immune system of an old person becomes weak because of . . . . . . .

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