Quick answer: Food enters the human digestive system through the mouth before then moving through the pharynx, esophagus, stomach, intestines, rectum and anus.
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B. They from ionic compounds.
Ionic Compounds is formed by the reaction of Metal and Non-metal.
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Cell division is something that occurs when cells replicate. They go through a complicated process that split into 2 or more cells as a result.
It lights up the area its in and can start a fire