I think that nerve tissue is brain, epithelial is skin, muscle is intestines and connective is body joints :)
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.
I believe the term you are looking for is puberty.
I believe it was established by the department of health and human services (DHHS)
