Which of the following correctly orders part of a fish's respiratory system from the least complex to most complex?
cells -> gills -> tissues cells -> tissues -> gills gills -> tissues -> cells tissues -> gills -> cells
Question: Which of the following correctly orders part of a fish's respiratory system from the least complex to most complex?
A. cells -> gills -> tissues
B. cells -> tissues -> gills
C. gills -> tissues -> cells
D. tissues -> gills -> cells
Answer: