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Why have no fusion reactors been developed and built?
O Most of our energy needs will soon be met by fission reactors.
O The fossil fuel industry has blocked attempts to develop nuclear fusion.
O Normal materials cannot withstand the extremely high temperature required to initiate a fusion reaction.
O Scientists do not fully understand the fusion process.
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Answer :

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Final answer:

The main obstacle to developing fusion reactors is the inability to withstand the extremely high temperatures necessary for fusion reactions.


Explanation:

Fusion reactors have not been developed and built primarily due to the extreme challenge of achieving and maintaining the very high temperatures exceeding 40,000,000°C required to initiate fusion reactions. Current materials are unable to withstand these temperatures, making it unfeasible to harness nuclear fusion for energy production at this time.


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