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ANIMALS-EGGS.

AN  EGG  IS   A  SINGLE CELL,produced  by   the  female,  with  the  capacity    to   develop  into  a  new   individual.
Development    may  take  place   inside  the  mother's  body(as  in  most  mammals) or  outside  in  which   case    the  egg   has    protective  covering,  such  as  shell.Egg   yolk  nourishes    the  growing  young.Eggs  developing   inside  the   mother   generally  have  little  yolk,  because  the  young young  are  nourished   from  her   body.Eggs  developing   outside  may  also  have  little  yolk  if  they  are  produced   by   animals     whose  young  go through    a  larval   stage(such  as  a  caterpillar)  that  feed   itself   while  developing   into  the   adult  form.The   shelled   eggs  of  birds  and   reptiles   contain  enough   yolk  to  sustain  the  young    until it  hatches  into  a   juvenile  version  of  adult.



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