Answer:
D.)Nature is destructive and
mysterious.
Explanation:
The noun clause is <span>how the Aztecs made their astronomical calculations.
</span>Just invert the whole sentence - The subject of my next paper is <span>how the Aztecs made their astronomical calculations.
</span>The whole clause is used as the direct object.
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The first option would be the most reasonable one
Semi colon because after it says humans it is contradicting itself by saying the opposite. Hope it helps