The sentence which used coordinating conjunction in order to join independent clauses is sentence 3.
<h3>What is a coordinating conjunction?</h3>
A coordinating conjunction is a word that is used to join clauses into a single sentence. Examples include "but," "if," and "and."
In sentence 3, two independent clauses are joined into one sentence by the conjunction, "but."
Find out more on conjunctions at brainly.com/question/8094735.
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That's because she was an activist for environmental protection. Green as an adjective often refers not to the color, but rather to describe someone who is environmentally friendly. In this case, her literature fought for preserving the nature and save the environment, so it is therefore green.