Question

A snake can be distinguished from a lizard by the absence of limbs and
A. Girdles
B. Tympanum
C. Girdles and tympanum
D. Girdles and tympanum and movable eyelids

Answer 1

Snake and lizard comes in the category of reptilian. Lizard have movable eyelid, have external ear and also four legs. These features are absent in snakes. Girdles are present in snake while it is present in lizard. Lizards can also shed its tail when required.

Complete answer:
Snake and lizard both are reptiles but they have many differences in their body structure and function.
Some of the differences in them are given here: Snakes have transparent skin which covers the eye while lizards have movable eyelids. Some of the lizards have eyelids while some snakes don't. Lizards have legs while snakes do not have legs. Tympanum is the term used for the eardrum which is present in the external ear to receive sound waves from the environment. Snakes do not have external ears. They have internal ear structure but lizards have external ears. Girdles are the type of bone present in vertebrates. The set of bones in the appendicular skeleton which connects to the arm on each side comprises shoulder girdle or pectoral girdle. In humans three bones are present that are clavicle, scapula, and coracoid. Girdles are present in lizards while these structures are absent in snakes.
From the above information we can say that snakes can be distinguished from a lizard by the absence of limbs, girdles, tympanum and movable eyelids.

So, option D is the correct answer.

Note: Snakes and lizards have many differences in their bodies. Lizards shed their tail when agitated or in a dangerous situation. It is said to be the escape mechanism of lizards. Tail of the lizard can grow again. Shedding skin occurs in snakes. They shed off their skin once a year. Snakes and lizards have flexible jaws. Snakes can eat prey that is even larger than the size of the snake.