Why is it important for a young person to have a thymus?

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It is really important for a young person to have a thymus, because it is an organ that is involved in development of cells of the immune system, particularly T cells. A missing or malfunctioning thymus can make a child vulnerable to infections or developmental disorders. A person born without it will not develop a strong immune system and will probably die.

The thymus serves a vital role in the training and development of T-lymphocytes or T cells, an extremely important type of white blood cell. So Basically It's Needed For The Immune System And It Helps To Heal Faster When You Get Sick

the glands which are associated with each description is given below:

pancreas - is an endocrine and exocrine gland that secretes juices with enzymes for digestion. salivary glands- with protection and digestion in the mouth. liver- secretes bile for digestion.   lachrymal glands - secrete tears to moisten eyes and protect them from particles and infection.   sweat gland -regulates water, salt, and temperature. oil glands - to form a protective barrier on the skin.   goblet cells - secrete mucus for protection.