It means the completion or approval of a finished and definitive version of something.
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.
Sinotrial node or the SA node
please add answer choices to your other questions in order to get your questions answered faster.
Answer:
A. A snake is used to cold weather in fact they prefer it.