Answer:
it is necessary to keep our sense organ clean and healthy for if don't clean our sense organ clean we may suffer from many disease like if we don't clean eyes we can't see anything, if we don't clean ear we can't listen anything, and if we don't clean nose it hard for breathing, and if we don't cleanour tounge should be dry and become our breathe smell is very bad, and if we don't clean skin we may suffer from many disease and that may we get cancer also.
Substance A will sink because it is more dense than water. An object that is more dense than water will sink and an object that is less dense than water will float.
In hair dryer,
A part of electrical energy is converted to Heat energy and a major part of it is converted to mechanical energy in the form of rotation of the blades at high speed.
Since Na has a 1+ charge and O has a -2 charge, by reversing the charges and placing them as subscripts for the other atoms the formula is Na2O1 or simply Na2O.
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