What distinguishes primary lymphoid organs from secondary lymphoid organs?
a. primary lymphoid organs are where B and T lymphocyles mature.
b. Secondary lymphoid organs are encounter their antigens primary lymhthoid organs are considered "primary" because they are larger than secondary lym primary lymphoid organs develop in the body sooner than secondary lymphoid organs primary lymphoid organs are where B and T lymphocytes originate.
c. Secondary lymphoid or none of the above