Why the bacteria have the fastest reproduction rate?

@ NEHA 
bacteria have very simple thing that is their cell donot have division of labour . 
unlike a higher organism , where vtissue level organisation is required , 
bacterial cells are free of any such requirment . 
they divide by binary fission and thats the fastest one . 
their dna is not bound inside a nucleaus , which allow simoultaneous transcription and translation . 
also the lack of nucleaus speeds the dna replication rate . 

HOPE IT CLEARS YOUR DOUBT 
ALL THE BEST ..