What is a 12 valve?

Early symptomatic HIV infection? What causes diminished hearing and a throbbing sound in only my left ear which sometimes stops? What are the top three mental and emotional problems that teens face? Difference between artery and vein histologically? The state of being prtected against a particular disease is? Which nutrient can prevent night blindness and other eye problems? When you bleach your hair then color it and a bald spot starts to show and your hair starts to thin will the hair ever grow back and get thick again? Do burns weaken the immune system? Do you have to wear headgear if you have braces? What is One signal of a breathing emergency in an infant? What is the atria of the lateral ventricle? A disease or disorder related to either the Urinary System or Reproductive System? What colour eyes has Louis Walsh got? What causes nose bleeds? What was Lazarus' condition or disease? What does pregnant mean? What phobia is the fear of slime? What is a by -product of breathing? Which glands responds to rising androgen levels? Which cells produce and secrete antibodies that set up bacterial invaders for subsequent destruction by macrophages?