Summary
(1) Bacteria are tiny colorless cell that cannot be seen with the naked eye. They are found everywhere in the atmosphere.
(2) Bacteria can be found in everywhere so including surface our body.
(3) Their reproduction process is through division of cells very quickly, making it difficult to kill them
(4) bacteria are unable to survive a high temperature in water and the reproduction process is also slowed down when it is extremely cold.
(5) Dehydration of foodstuffs will also stop the multiplication process as there is insufficient moisture for the bacteria to grow.