다음 글의 빈칸에 들어갈 말로 가장 적절한 것은? Anthropolog… | [법원직 9급 영어] 16년 1회차 기출문제 상세 페이지

다음 글의 빈칸에 들어갈 말로 가장 적절한 것은? 
Anthropologists believe wisdom teeth, or the third set of molars, were the evolutionary answer to our ancestor’s early diet of coarse, rough food ⎯ like leaves, roots, nuts and meats ⎯ which required more chewing power and resulted in excessive wear of the teeth. The modern diet with its softer foods, along with marvels of modern technologies such as forks, spoons and knives, has made the need for wisdom teeth nonexistent. As a result, evolutionary biologists now classify wisdom teeth as vestigial organs, or body parts that have become functionless due to        .

dental decay

evolution

hardness

their shape