There are many theories about why living thins sleep, however, scientists are still unsure about what the answer to this question may be. Some say it is because of its restorative powers - after a good night's sleep, you feel rested, and all your brain and bodily functions work better than when you are exhausted. During sleep, some rejuvenating and growth hormones are created, which again adds to our advantage. You also relieve stress that has accumulated during the day. These are some of the reasons why we have to sleep.
Answer:
Drought in this region is frequent, lasting one to two months on average, and ... Prairie grasslands extend eastward from the Canadian Rockies to the ... The extreme nature of climate on the prairies was first highlighted in relation to ... prairies, a well-defined gradient existed in Tmn, extending from a high of around −12.5 °C
