In frogs,the eyes are .....

Male frogs can be distinguished from female frogs due to the presence of:
$A$. Bulging eyes
$B$. Vocal sacs
$C$. Webbed digits in feet
$D$. Copulatory pad on first digit of fore limbs
$E$. Olive green-coloured skin with dark irregular spots
Choose the correct answer from the options given below:

The croaking of a frog is:

The sensory papillae in frogs are associated with

Which of the following structures is not present in a female frog?

Parotid glands are found in