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?

  Options: 
 A. the endocrine and skeletal systems
 B. the circulatory and respiratory systems
 C. the skeletal and muscular systems
 D. the integumentary and excretory system
Answer: C