Chapter 28, Problem 19A

Summary Introduction

To write:

The correct term by replacing the italicized word in the given sentence.

Introduction:

Amphibians include frogs, toads, salamanders, newts, and legless caecilians. Most amphibians are distinguished by moist skin without scales, four legs, exchange of gases through skin, a circulatory system with double loop, lungs, and aquatic larvae.

Explanation of Solution

The amphibian ear shows the adaptation to life on land. The tympanic membrane is an eardrum. In frogs, it is a thin outer membrane on the side of the head. Frogs use their tympanic membrane to hear high pitched sounds and to amplify sounds from the vocal cords.

Conclusion

Thus, the tympanic membrane enables amphibians to hear the various sounds. It helps the amphibians to hear the sounds of high frequency.