Q:
      
      
         
            
Which of the following classes of animals has/have three-chambered heart?
         
       
      
      
      
          
      
      
          Answer & Explanation
         Answer: B) Amphibia and Reptilia         
         
Explanation: Mammalian and avian hearts have four chambers two atria and two ventricles.Amphibians and reptiles, by contrast, have a three-chambered heart. The three-chambered heart consists of two atria and one ventricle.Fish possess the simplest type of true heart a two-chambered organ composed of one atrium and one ventricle.
       
      
      
      
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