What is the likely source (reservoir) of organisms that grow best at 37 and how do you think they survive at room temperature without nutrients?

The source of organisms would likely be from host such as humans, they were able to survive at room temperature without nutrients is by lowering their metabolic rate, by lowering it and or slowing it down, they don't constantly seek for nutrients and this will enable them to survive this long at room temperatures.

The answer depends on your choice of part .for example if its the heart, u will die