Which of the following is an example of horizontal gene transfer in bacteria?

All organisms have specific environmental conditions in which they thrive. Most organisms cannot live in extremely salty environments. If a bacterium that normally lives in a fresh water environment is placed in an environment that is excessively salty, what will happen?

There are two groups of bacteria which live in the Great Salt Lake: Halobacterium and Halococcus. The Great Salt Lake's average salinity is around 13%. What class of microbes do the Halobacterium and Halococcus species belong to?

Methanopyrus kandleri is a species of archaea that lives in the hydrothermal vents of the Pacific Ocean. This species' optimal temperatures are between 100-122 ºC. This species also does not require oxygen, as it survives off of hydrogen gas and releases methane gas. What environmental classifications would this archaeal species fit into?

Acidobacterium capsulatum is a species of bacteria that grows better in the absence of oxygen but can survive if oxygen is present. This species of bacteria also thrives in soil and water with a pH between 3.0 and 6.0. What environmental classifications would this bacterial species fit into?