Chiroptera writes:
I can't see any reason why a lymphoid tissue needs to be contained in a blind sac
Because if your blind sac doesn't have any accumulation of lymphoid tissue, you will surely die from any infection that is bound to be trapped there. If your minor appendiceal inflammation develops into appendicitis, and that isn't kept in check by a massive immune response, it could easily develop into peritonitis and eventually septic shock and death. It's easy to see why that evolved.
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What do you mean "You can't prove a negative"? Have you searched the whole universe for proofs of a negative statement? No? How do you know that they don't exist then?!
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