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Chapter 29: Q. 31 (page 827)

What characteristics differentiate lizards and snakes?

Short Answer

Expert verified

Lizards differ from snakes by having eyelids, external ears, and limbs.

Step by step solution

01

Introduction

  • Lizards and snakes belong to the order Squamata of reptiles.
  • The order Squamata is the largest of the reptiles.
  • Lizards and snakes are most closely related to tuataras, both groups having evolved from a lepidosaurian ancestor. Both are found on all continents except Antarctica.
02

Explanation

Most lizards differ from snakes by having four limbs, although these have been variously lost or significantly reduced in at least 60 lineages. Snakes lack eyelids and external ears, which are present in lizards.

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Most popular questions from this chapter

A marine biologist catches a species of fish she has never seen before. Upon examination, she determines that the species has a predominantly cartilaginous skeleton and a swim bladder. If its pectoral fins are not fused with its head, to which category of fish does the specimen belong?

a. Rays

b. Osteichthyes

c. Sharks

d. Hagfish

Which of the following reptile groups gave rise to modern birds?

a. Lepidosaurs

b. Pterosaurs

c. Anapsids

d. Archosaurs

Which of the following is not an anthropoid?

a. Lemurs

b. Monkeys

c. Apes

d. Humans

Which of the following is part of a clade believed to have died out, leaving no descendants?

a. Paranthropus robustus

b. Australopithecus africanus

c. Homo erectus

d. Homo sapiens sapiens

Which of the following is not true of Acanthostega?

a. It was aquatic.

b. It had gills.

c. It had four limbs.

d. It laid shelled eggs.
See all solutions

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