long ago many people believe that living thing could come from non living thingsthey thought that worm come from decaying meat this idea was called sponteneous generation in 1668 an italian biologist francesco redi redi did experiment to prove that magget didnot come from meat redi placed pieces of meat in several jars he cover the first grouppf jar and leave second openhe saw flies laying eggs on uncovered jarsmagget appears only on the meat in the group of jar left uncovered