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The opposite is "unsterilized."
Yes, the turbidity in the unsterilized nutrient is supposed to be incubated, Incubation will give the desired and correct results.
Wherever you have unsterilized water, you have microbes.
Yes, un neutered males will try to mate with spayed females.
Usually they use sterilized poppy seeds because fresh/unsterilized ones contain minute levels of opium.