The mating is the first event that happens in the development of a new organism because you may have A lion and a word you know that's not possible that would be a possible new organism that have not been formed yet but the mating would be the first thing that would happen
The source of the infection most would be the first patient who contaminated the instrument used for endoscopic procedures since washing the instrument did not remove the bacteria so it does not come from the water, detergent or glutaraldehyde. Hope this helps. Have a nice day.
Earth is the only one you can live on
