The answer is: They exists only in the Northern Hemisphere.
It is possible to find a glacier in other spots in the world.
One is probably because your friend has a stronger immune system than you and is able t fight the bacteria infection. The other is probably that your friend is also infected but does not show any symptoms of the infection, in what is referred to as latent infection. The bacteria enters a lysogenic cycle in your friend’s body rather than the more virulent lytic cycle (that happens to you).
<span>A scientific theory summarizes a hypothesis or group of hypotheses that have been supported with repeated testing.A scientific theory is a well-substantiated
explanation of some aspect of the natural world, based on a body of
facts that have been repeatedly confirmed through observation and
experiment. Such fact-supported theories are not "guesses" but reliable accounts of the real world.</span>
