Question

1. based upon the fast facts about the thymus gland, what is one reason that people are more susceptible to getting sick as they get older?

Explanation:

The thymus gland is critical for maturing immune cells called T-lymphocytes, which fight infections. As people age, the thymus gradually shrinks and is replaced by fatty tissue, a process called involution. This reduces the production of new, functional T-cells, weakening the immune system's ability to defend against pathogens, making older people more prone to illness.

Answer:

As people age, the thymus gland shrinks (undergoes involution) and produces fewer functional T-lymphocytes, which are essential for fighting infections, weakening the immune system and increasing susceptibility to illness.