Answers edited by Shivangi Mangotra

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• Question #8a3a2
  
• Where is the epiglottis located?
  
• What is matter?
  
• Question #e5d23
  
• What property is measured by a ruler?
  
• A light ray approaches a mirror at an angle of incidence of 25°. What is the angle of reflection?
  
• What is the ionosphere?
  
• What is a valence shell?
  
• Question #783f3