immune and excretory digestive and respiratory nervous and skeletal circulatory and integumentary
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: When a soccer player kicks a ball, which two systems work directly with the muscular system?
Possibilities:
- immune and excretory
- digestive and respiratory
- nervous and skeletal
- circulatory and integumentary

nervous and skeletal