Which Statement About the Respiratory Organs of Animals Is True

Multiple Choice

Which statement about the respiratory organs of animals is true?

A) Most water-breathing animals have lungs.
B) Most air-breathing animals have gills.
C) External gills are highly branched, thin extensions that maximize diffusion distance.
D) Lungs are usually unpaired and elastic.
E) The respiratory organs of air-breathing insects are called tracheae.