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          Multiple Births
          Beginning of essay 
 are rare in humans with twins as being the most common form
of this event.   can arise in many different combinations of ways
but the probability of giving birth to more than one child remains fairly
constant when compared to the entire human race.  The chances of 
can also vary from race and gene ....
          Middle of essay ....n births result in the birth of twins.  Twins can be fraternal, also
known as dizygotic twins, or identical, also called monozygotic twins, with the
birth of identical twins being the rarest, occurring about four times in every
thousand births, about one-forth as often as the birth of fraternal twins.  This
ratio of the birth of twins to the total number of births remains fairly
constant but the birth of fraternal twins can alter greatly.  Fraternal twins
are most common among black African foll....           |   
          
          
          | Number of words: 1090 | 
          Approximate pages: 4 | 
           
           
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