18 A scientist developed a map of Earth in space shown in the diagram. She wanted to use the information on the map to help answer a question. Which question is the scientist most likely trying to answer? F. How long does it take Earth to move around the Sun? G. Which stars can be seen during the summertime? H. How close are the stars to each other and the Sun? I. Where in space are the stars that form the Big Dipper located?

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Sleep Physiology

Sleep is a condition of reduced muscle movement in the body. Awareness about the surroundings is reduced at the time of sleep. The body stays mildly responsive or non-responsive to external stimuli. The sleep-wake cycle is controlled by the circadian rhythm that produces a resting phase for the body.