They are not. I have not only ever used a waterfall for messing about when I was young.
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Most people go their daily lives without thinking of proof - more's the pity!
It is important to our daily lives because for instance, you walk into a shop and the shop keeper can not work out how much change to give you it would take forever and a day. Ever when your not thinking about maths your doing it. Paying a bus fair, driving a car or even just ocutnting a group of people. Maths is used all the time.
you live in a house with wood in the framing, which comes from trees. Paper is made from trees. Anything made of cardboard is a tree biproduct. hope this helps.
water and salt are some examples of inorganic compounds that we can use in our daily lives. because both of them do not have carbons. water=H2O. salt=NaCl or sodium chloride. Inorganic Compound subo tite and kantot me