Ubiquity of Microbes Discussion

Subject: General Microbiology 

Suppose  during a laboratory period you were provided with sterile Petri dishes to expose to the environment in the following ways (inoculation):

  1. 1. Several coins pressed temporarily on the media

  2. 2. Hair combed over exposed petri-dishes
  3. 3. Expose the petri-dish by coughing onto it 
  4. 4. Swabbing your skin and inoculating the petri-dish with swab

Discuss what you would expect to observe on the Petri dishes (#1-4) after 48hrs of incubation ?  which habitat sampled would you expect to contain more bacteria and why?