_____is considered to be ultimate source of fossil fuels.

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Sun

Soil

Water

Air

answer is A.

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Detailed Solution

Concept: Animals and plants both require sunlight to survive. To work, they need energy. Even after they pass away, they still contain this energy. They may contribute to fertilising the ground where they are buried. They can offer us a variety of other goods.
They develop when an animal, plant, or other organic material is pressure-buried underground for a very long time. Fossil fuel can be created from this substance.
The sun is the source of energy for both plants and animals throughout their lives. Once they pass away, the energy that was stored within them is used as fossil fuel. Through the use of this energy, which is obtained from the sun, methane, petroleum, and other substances are formed.
Even though burning fossil fuels releases a lot of harmful gases, we are unable to completely stop their use. There is no other option that can match the amount of energy produced. However, researchers are working to either make them harmless or discover a substitute that could match its effectiveness.
Hence, option 1 is correct.

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