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Practice Reading: Reading Fill in the Blanks ID: #50566 Fish Dispersal
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Small  lakes  with  a  surface  area  of  less  than  100  ㎡  represent  the  majority  of  global  freshwater  ecosystems.  Many  of  these  lakes  are  found  in  ,  often  mountainous  areas  with  no  inflow  and  outflow.  Yet  in  most  of  these  lakes,  there  are  fish.  So  how  do  fish  reach  lakes  and  ponds  that  are  not  connected  to  other  bodies  of  water?  This  question  was  already  addressed  by  some  of  the  leading  natural  scientists  of  the  19th  century  such  as  Charles  Darwin,  Alfred  Russel  Wallace  and  Charles  Lyell,  who  all  came  to  the  same  conclusion  –  water  birds  must  be  responsible  for  fish  .  And  they  had  a  plausible  explanation  for  this:  fish  eggs  of  some  species  are  sticky  and  can  survive  for  some  time  out  of  water.  The  theory  is  thus  that  the  fish  eggs  stick  to  water  birds’      or  feet;  the  birds  then  fly  from  one  body  of  water  to  the  next,  where  the  fish    from  their  eggs.

evolution dispersal hatch broad remote differ feathers

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PoS Classification

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