Task: Paraphrasing
Input (English): Question: Which sequence identifies the levels of organization of body structures in a human from simplest to most complex? 
Answer: cell → tissue → organ → organ system. 
Sentence: The sequence cell → tissue → organ → organ system identifies the levels of organization of body structures in a human from simplest to most complex.
Output (English): cell → tissue → organ → organ system is the sequence which identifies the levels of organization of body structures in a human from simplest to  most complex.