Thoreau mostly uses imagery to illustrate time in the excerpt. The second sentence is saying that he is in the midst of time/living, and he can "detect how shallow it is," meaning that he is aware that life is short and that the end is inevitable. Thoreau also describes time as being fleeting, but ever-present.
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Answer:
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Answer:
A. Mammoth fossils have been found
Explanation:
This is the answer because it means main idea and it is not B because it is just a detail in the central idea just like C & D.
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The answer is D. HOPE THIS HELPS