<prompt> Which of the following is a bacteria taxonomically -a Chlamydiab Rickettsiac Mycoplasmad Prione Bacteriophageababcacdbcd  <response>: BacteriaBacteria are single celled microorganisms which can exist either as independent free living organisms or as parasites dependent on other organisms for life.There are typically 40 million bacterial cells in a gram of soil and 1 million bacterial cells in a millilitre of fresh water; in all, there are approximately five nonillion 5 x 1030 bacteria on earth. 