List five exothermic reactions that are going on around you

1) exhalation

2)neutralization reaction of antacids

3)washing clothes with detergents release a small amount of heat

4) degradation of biowaste

5) adding water to calcium oxide

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c because the action was the roller coaster reaches bottom of hill (action) reaction would be blood tends to drain away from head

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i don't understand. explain it clearly