Sexual relations usually do not spread hepatitis C. Hepatitis C is spread when infected blood gets in contact with non-infected blood (something that does happen during sexual relations).
Answer:

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Answer:
developing air conditioner
Explanation:
Air conditioner is the only answer choice that directly relates humans to the environment.
That condition is called Bulimia.
Answer:
The correct answer to the question: REM rebound involves the:___, would be: Tendency for REM sleep to increase following REM sleep deprivation.
Explanation:
REM sleep, also known as Rapid Eye Movement is one of the stages of sleep in which, depending on the depth of sleep, there is a loss of coordination of the muscle movement of the eyes. Usually, this stage of sleep requires a certain amount of time to happen, since it is a deep state, but in REM rebound what we have is a person who has been deprived of REM sleep for a period of time, and who, after finally falling asleep will experience lenghtier and much more frequent episodes of REM sleep than those who haven´t. As the term "rebound" involves, it is like the body comes back from its forced lack of proper rest and as retribution prolongues these periods to accomplish the needed rest.