A. concentration gradient across the respiratory surface
B. concentration gradient across the respiratory surface B. presence of thin membrane as the respiratory surface
C. last transportation of absorbed gases
D. presence of large surface area of the respiratory organ
E. presence of small, dry surface area of the respiratory organ

Correct Answer:

Option E – presence of small, dry surface area of the respiratory organ

SEE ALSO  Fingerprints are useful in crime detection because?

Copyright warnings! Do not copy.