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The friction between two or more clouds cause them to heat up then it turns to static electricty and then hits the ground i hope you are happy anfd i hope this is correct :)
Well we can always smell things like if food smells bad or if we smell something we have to know whether that smell is good or bad. You could be able to smell animals that are dangerous. Or animal droppings, to know what animal it is if you are in danger.
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Answer:
Because winding roads have a gentle slope on hills, so it's easy to climb it than a steepy.
