Which organ system is primarily responsible for transporting oxygen and nutrients throughout the body?
- ADigestive system
- BCirculatory systemĐúng
- CIntegumentary system
- DSkeletal system
Vì sao: The circulatory (cardiovascular) system uses the heart, blood, and vessels to transport oxygen, nutrients, and waste throughout the body. The digestive system breaks down food, and the skeletal system provides structure.



