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  title of the text about animal kingdom  
         
  The animal kingdom comprises two main groups: vertebrates and invertebrates. Before reading further about them, watch the funny video my "boss" has especially created on the subject for you.

  



  VERTEBRATES
Vertebrate animals have a spinal column (also known as spine) formed by small bones, each called a vertebra. Man possesses 24 vertebrae: 7 cervical, 12 dorsal and 5 lumbar. Generally speaking, vertebrate animals have two pairs of limbs. There are five main classes of vertebrates: mammals, birds, fish, amphibians, and reptiles. Dogs are vertebrate mammals.

  
 
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INVERTEBRATES
Invertebrates are animals lacking a backbone: insects, spiders, shrimps and other crustaceans, molluscs, worms, and so many others.

 
 
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