Answer:
No,it is not important that it must be only fire it may be other source also
Hey there,
Answer
The discovery of gold
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It would help if i had your choices.. But I believe the answer is agriculture.
True I think tell me if i am wrong please I what learn from my mistakes
The answer is Radon. Radon is an odorless, colorless and tasteless gas. It is the heaviest among the noble gases. It is, in fact, radioactive. Radon is considered to be a health hazard. It is so radioactive that further studies become very difficult. When radon decays, radon progeny is produced. These new substances stick to the surfaces of dust particles in air. When inhaled may stick to the lung and airway walls.