Answer: going to bed at different times each night
Explanation: To keep the body to understand what is going to happen, by getting enough sleep without messing up the body pychologicly, it allows the body to adjust its internal clock.
Responsible friends would never engage you in risky behaviours, especially in sexual ones. Responsible friends are most likely not to do this kind of things, but you also have to be responsible.
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Conception occurs when the male gamete fertilizes the female gamete.
Answer:
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