muscular and nervous digestive and muscular cardiovascular and nervous cardiovascular and muscular
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: The respiratory system cannot deliver oxygen to the cells of the body, nor can it remove carbon dioxide, without which two body systems?
Possibilities:
- muscular and nervous
- digestive and muscular
- cardiovascular and nervous
- cardiovascular and muscular

cardiovascular and muscular