An organ that is used by earthworms, leeches and frogs (under water) for the exchange of gases, is
A. moist skin
B. spiracles
C. gills
D. none of these
Answer:A
An organ that is used by earthworms, leeches and frogs (under water) for the exchange of gases, is
A. moist skin B. spiracles C. gills D. none of these