The main idea of this paragraph is that the rocks cannot be explained by science, that there is a mystery to them. This sentence contributes to that idea because it gives a specific example of one of the odd things about the rocks. Because they are on a flat surface they should not roll or move on their own, but the fact that they have a trail behind them shows that they have somehow moved. This supporting statement is then supported by more details about the trails.
Answer: these
Explanation: demonstrative pronouns: this, these, that, and those
I believe the answer is Work Ethic:)
Hope this helps:)
@SamySamSamantha
The answer is exhausted the context clues given allows you to understand that she is tired from rowing all day not annoyed or happy
Indeed the correct answer is
<span>c) small pieces of matter</span>
