Answer:
The central idea of this paragraph is elf protection and the way an animal defends itself from it's predators.
Explanation:
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Since medieval guilds were unions made up of working men, the correct answer here would be 'labor unions'.
The answer is C. This is because but is being used as a conjunction separating independent clauses in the other answers. You can remove but from A, B, and D, and you are left with 2 simple sentences.
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B)
By 2025, the demand for renewable energy will exceed the supply of fossil fuels