circulatory and skeletal systems skeletal and excretory systems muscular and circulatory systems respiratory and muscular systems
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which pair of systems is responsible for the flow of blood in the human body?
Possibilities:
- circulatory and skeletal systems
- skeletal and excretory systems
- muscular and circulatory systems
- respiratory and muscular systems

muscular and circulatory systems