The purpose of an adjective clause is using a subject and verb that provide a description of the sentence. Impact allow the reader to understand what is occurring and why it is occurring. Who cause the affects? Or where is it happening? Ect.
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Answer:
They are older by five years?
Explanation:
I believe it is c. Sentence 4 because it states that Chimpanzees use leaves. It introduces key details to support that claim. It also asks where the second major detail in the paragraph is introduced.I hope this helped and im not sure that this is the correct answer but i believe so.