Which is the ultimate source of energy?

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Water

Uranium

Sun

Fossil fuel

answer is A.

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Detailed Solution

The ultimate source of all kinds of energy on earth is the Sun, either directly or indirectly.
Fossil fuels such as coal, oil and gas, are the transformed forms of plants (and animals) which once lived on the earth and grew, capturing the energy of the sun.
The Sun is an extremely massive mass of gas, where continuous thermo-nuclear reactions are taking place producing enormous quantities of heat and light.

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