Wow, that's a lot of questions!
First off, no organism, bacteria or otherwise,
can survive in a pure oxygen environment.
Viruses can't survive very long on their own, and
in order for viruses to reproduce, they need
living hosts nearby for them to infect.
In your scenario, the pure oxygen environment
would quickly kill the bacteria, and so the
virus would "die" too, eventually. (I say "die" in
quotes because many scientists do not think
viruses are alive, and if viruses aren't alive,
then they can't die. Personally, I think viruses
ARE alive, but it's sort of a philosophical
question about how you define life.)
The pure oxygen environment probably wouldn't
kill the virus itself, since viruses don't have
all the chemical processes (metabolism) going on
inside them that every other living organism does.
Pure oxygen would poison any organism
that depends on chemical reactions for life
(basically, every organism except viruses). Most
viruses can only infect one type of organism (a
human, a cat, a cow, a plant, a bacteria).
However, no matter what organism you put into a
pure oxygen environment, it would die, so the
virus would as well, since it can't reproduce
without it's host and it can't survive too long on
it's own.Here's another scenario: Imagine if you built
an enclosed fish tank, with plants for oxygen and
many different marine organisms so that there was
enough food for the fish to eat. Now imagine that
you were able to remove ALL the viruses from this
fish tank, even the viruses floating in the sea
water and in the air at the top of the tank. (This
would be impossible to do, but we're just
imagining here.) If the fish tank was really
closed to outside air, then the plants and animals
in tank would never be infected by a virus ever.
Now imagine if you could introduce just ONE virus,
a virus that infects one type of bacteria floating
in the seawater. Every plant and animal in that
tank could co-exist happily with the virus except
the bacteria, which would become infected. You
could almost argue that even the population of
bacteria being attacked by the virus could
co-exist in harmony with the virus, since the
virus wouldn't kill ALL of the bacteria, just a
few. If viruses killed ALL their hosts, they'd
quickly make themselves extinct.
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