Where are 5 extreme places where bacteria live?

Answer 1

If you are talking in or on the human body, I don't know. But if you mean where are 5 extreme places where bacteria live in the world, then here are some:

Antarctica, the deep ocean, thermal vents under the ocean, in extremely hot water near thermal vents on land and in desert sand where the temperature is incredibly hot.

Bacteria can live in very extreme places like the extremely freezing temperatures of the ice floating on lake Vostok in antarctica and the near boiling hot springs in Yellow Stone National Park USA