Answer:
숨을 들이쉴 때마다 폐포가 공기로 채워져 폐가 확장됩니다.
Explanation:
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It is a vestigial Structure.
Explanation:
It is distinctive, widespread, abundant and limited in geologic time. Because most fossil<span>-bearing rocks formed in the ocean, the major </span>index fossils<span> are marine organisms. That being said, certain land organisms are useful in young rocks and in specific regions.</span>
