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General Biology 2 Final - 2! 2부
샘플
이것은 샘플 연습 세트입니다. 보다 개인화된 시험 준비 경험을 위해:
또는
47. Muscle Systems / Musculoskeletal System / 문제 12
문제 12

The skeleton which consists of fluid held under pressure that gives the hydra its body shape and support for muscle action is called ______.