What feature distinguishes male frogs from female frogs?

Step-by-step solution

. Have you ever touched the skin of frog? The skin is smooth and slippery due to the presence of mucus. The skin is always maintained in a moist condition. The colour of dorsal side of body is generally olive green with dark irregular spots. On the ventral side the skin is uniformly pale yellow. The frog never drinks water but absorb it through the skin. Body of a frog is divisible into head and trunk A neck and tail are absent. Above the mouth, a pair of nostrils is present. Eyes are bulged and covered by a nictit