the digestive system and the circulatory system the circulatory system and the respiratory system the respiratory system and the skeletal system the skeletal system and the digestive system
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Bone cells need nutrients. Which two systems get nutrients to bone cells?
Possibilities:
- the digestive system and the circulatory system
- the circulatory system and the respiratory system
- the respiratory system and the skeletal system
- the skeletal system and the digestive system

the digestive system and the circulatory system