What does thymosin stimulate?

Which endocrine gland is not ectodermal in origin?

According to the modern theory of aging,our body gradually loses its ability to resist bacteria and pathogens. This process is caused by the gradual disappearance (atrophy) of which organ?

Which gland gradually decreases in size with increasing age?

The thymus gland develops from the embryonic ..........

What would happen to the immune system if the thymus gland is removed from the body of a person?