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Some fishes needs Sea Water to survive, that can be one possible way that it is useful.
Rehearsing
In teaching, useful repetition is when you reinforce the learning several times to help people to grasp the concept. Repeating it in different ways or over a period of time helps the repetition to be useful.
radiation energyheat energykinetic energypotential energychemical energy
Science is useful in an unlimited number of ways. It determines the kinds of technology advances, medical breakthroughs, and conservation efforts, among other things, that are possible.
Plutonium is not used in everyday life.
Algebra is used in lots of differant ways in everyday life because it's maths.
Personal organizers are useful to have with you. They help you organize your everyday life. Instead of having separate ways to keep your calendars, notes, addresses, etc, a personal organizer allows you to keep them all in the same place.
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Some ways granite is used in everyday life is in table tops, floors, and kitchen surfaces.
sales tax is a percent
When you pull the blinds up in your house
Virtualization can be used many different ways in everyday life. Those who use hypothetical situations in their work would use this everyday.
In real life its not useful, unless you're going to need geometry in the career you choose.
Geometry is used by many things, in many different ways.
In what ways are enterpreneurs useful to suppliers
explain risks as part of an integral part of every day life