English
高中

黄色の下線部で引いた文についてなのですが、in whichの、in の意味がわかりません。なぜここにinがあるのでしょうか?

o bored, sleepy, or because our bodies are tired、 [6| Still another theory is that yawning started with our ancestors. When you yawn, you also show your teeth。 Some scientists believe that this was a way in which ancestors frightened others, such as when a ion roarsY Onetheory states that Lyaming may have
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