Unlike some archaeas most bacteria die when their environment reaches extremely high temperature. how can people kill harmful bacteria that might live in some human foods?

bacteria in food can be killed by many means such as:

a) Pickling. for example food is pickled as bacteria cannot live in very acidic conditions.

b) Boiling. boiling water or liquids can help kill bacteria present in them.

c) Using preservatives can also help

d) Immersing food in salt or sugar solutions is also an other way

not sure if this is what you'r looking for eubacteria and archaebacteria