the endocrine and skeletal systems the circulatory and respiratory systems the skeletal and muscular systems the integumentary and excretory system
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: In eukaryotic organisms, microtubules give cells structure, and microfilaments help the cell contract and move. Together, they combine to perform functions similar to what two human body systems?
Possibilities:
- the endocrine and skeletal systems
- the circulatory and respiratory systems
- the skeletal and muscular systems
- the integumentary and excretory system

the skeletal and muscular systems