At what stage in the life history of a toad is its mode of breathing similar to that of fish?
A. Tadpole stage
B. External gill stage
C. Adult stage
D. Internal gill stage
E. Larval stage
B. External gill stage
The correct answer is B. External gill stage.
During the external gill stage of a toad's life, it breathes through external gills, similar to how a fish breathes with its gills. As a tadpole, the toad does not have lungs yet, and it relies on gills for oxygen exchange. Later in its life, during the adult stage, the toad develops lungs as its primary mode of breathing.