Put the following biological structures in the correct order of organization,
from smallest to largest:
A. Squamous epithelial cell, alveoli, lung, respiratory system, fish
B. Squamous epithelial cell, alveoli, lung, respiratory system, dog
C. Respiratory system, dog, alveoli, lung, squamous epithelial cell
D. Squamous epithelial cell, lung, alveoli, respiratory system, dog