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.
The unit value of the 6 is the ones value
Answer: The statement above is absolutely true.
Explanation: During our sleep we pass through five stages of sleep. 5th stage of the sleep is of great importance and is known as REM sleep aka rapid eye movement sleep. During this stage heart rate, breathing and eye movement increases. According to the researchers of Neuro-scientists Rem sleep helps the brain rewire itself and integrates new memories and train the mind for important tasks to be done next day.
Unusual or prominent convexity of the abdomen, due to excessive subcutaneous fat, poor muscle tone, or an increase in the contents of the abdomen.