21. In what ways are lungs and gills similar?
A. Both are used for circulating blood through the body.
B. They both are used in animal mating behavior.
C. Both are organs animals use to exchange oxygen & carbon dioxide.
D. None of the above.
Gills is a site for gaseous exchange in fishes amphibians at some stage in life; while the lungs is a site of gaseous exchange in mammals and other organisms such as reptiles.
