A host to feed off of, the right temperatures, basically the right living conditions for that type of bacteria. Most of the time it depends on the type of bacteria.
The answer is b. Kathmandu.
Answer:
U-shaped valleys, hanging valleys, cirques, horns, and aretes
Explanation:
Land forms can affect people by elevation, like a plateau, it's elevated an means colder, which means less species, which means humans lving there adapt, something like that.