FOR EXAMPLE:
Let's say you've been taking melatonin every single night to help you sleep. After a while, you may notice that it begins to take more and more melatonin for it to work like it did the first night you took it. You were taking one per night, but you end up taking 3 per night to get the same effect because your body has resistant to the drug.
ANSWER:
After a while of taking antibiotics, microorganisms in your body may become resistant to the antibiotics (which is potentially dangerous). This occurs when bacteria change to reduce the effects of a drug.
never would be but if it does occur it would be rarely
Answer: alternative D.
Explanation: The animals that go through this process understand that everytime they drink the unusual-tasting liquid they will be injected, being that a very unpleasant series of events. They are conditioned, therefore, to be afraid of the unpleasantness of this process by associating pain to the actions that are part of it.
