64.   You inoculated two tubes of liquid culture media with…

64.   You inoculated two tubes of liquid culture media with 100 bacterial cells, and                  incubated one tube at 37oC and the other at 55oC.  After 48 hours incubation,                you  Counted 20,000 bacteria per ml in the 37oC tube and 1,000, 000 bacteria per ml in the 55oC tube.  You can conclude that this species is a: