A(n) is substance in which one or more atoms have the same number of protons (i. e. the same atomic number).
Answer here
element
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Explanation:

the answer is element

semidiurnal tides is !

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the most common energy conversion is from kinetic energy to potential energy, and then from potential energy to kinetic energy.

later on comes the heat energy, mechanical energy, and other energy conversions.

this energy conversion is so common that we can find it in our day to day lives as well.

- one of the most common energy conversions involves the changing of potential energy to kinetic energy or kinetic energy to potential energy