Answers edited by Brittney. C.M

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• What are three antigens that may be present on human red blood cells?
  
• What is a disease of the bone in which bone reabsorption outpaces bone deposit, leaving the person thin and fragile?
  
• What is the most "useless" organ in the human body, besides the appendix?
  
• What is the molar mass of #NaNO_3#?
  
• How long do stretched ligaments take to heal properly? How long before I should get on the rugby field again?
  
• How much do human intestines weigh?
  
• What happens if an A type person receives B blood? What happens if an AB type person receives B blood? What happens if a B type person receives O blood? What happens if a B type person receives AB blood?