Biology · STRUCTURAL ORGANISATION IN ANIMALS

Male frogs can be distinguished externally from female frogs by the presence of:

1. A
   Nictitating membrane and tympanum
2. B
   Webbed feet and olive green skin
3. C
   Copulatory pad on the fourth digit of hindlimbs
4. D
   Vocal sacs and a copulatory pad on the first digit of forelimbs