[Talking_Mouse]

Interestingly enough, an evolutionary paradigm led to the wrong conclusions about the appendix and tonsils being vestigial.

I had always been told that they were vestigial. What is your evidence that they are not? I have not seen any (not that I have looked hard), so I am rather interested.

[AndrewC]

I had always been told that they were vestigial. What is your evidence that they are not?

Immune system

The immune system includes organs and tissues in which lymphocytes predominate as well as cells that circulate in peripheral blood. Lymphoid organs includes: lymph nodes and vessels, spleen, tonsils, adenoids, appendix, bone marrow, thymus, and intestinal lymphoid tissue. The bone marrow and thymus play a role in developing the primary cells of the immune system: B cells and T cells.

[frgoff]

I had always been told that they were vestigial.

They've both been discovered to play an important role in the human immmune system. A quick google should give you the info.