The sun creates it's own light, also gives light and life to bunch of stuff like plants,animals,humans etc. photosyntesis is the process of making food which needs sun,water,nutrients etc.
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All characteristics of life rely on the sun.
As food reaches the end of the esophagus, it enters the stomach through a muscular valve called the lower esophageal sphincter. The stomach secretes acid and enzymes that digest food. Ridges of muscle tissue called rugae line the stomach. The stomach muscles contract periodically, churning food to enhance digestion.Mar 4, 2016