Answer:
It becomes a giant or supergiant.
Explanation:
Once all the hydrogen supply is gone, fusion of hydrogen into helium stops. The core starts to contract and liberates energy, which heats the superior layer until it becomes hot enough to start the fusion of hydrogen into helium.
It can solidify, it depends on the tempeture.
Its A: the use of hydropower often changes the natural flow of water through an ecosystem
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