関連ワード:  why do we even have an appendix    why do we still have an appendix    why do we still have your appendix    do we even need an appendix    why do i still have my appendix    why do i still have pain after appendix removal    do we really need an appendix    do we still need an appendix    why do we have an appendix if we don't need it    why do humans have an appendix even though it is unnecessary