The common Indian bullfrog is $Rana$ $tigrina$.

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:

Frogs lack a neck. This feature helps the frog in:

Neck is absent in a frog. This helps the frog in:

The adult frog is:

The dorsal side of the frog is $.......$ and the ventral side is $...........$.