A hypothesis to explain the origin of mammalian ear bones. Introduction: The cynodont is the most diverse group of animals that includes mammals and their ancestors. In the Triassic cynodont, the ear bone was the part of the jawbone.

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Chapter 32, Problem 11PIAT

Summary Introduction

To review:

A hypothesis to explain the origin of mammalian ear bones.

Introduction:

The cynodont is the most diverse group of animals that includes mammals and their ancestors. In the Triassic cynodont, the ear bone was the part of the jawbone.

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Mammals have a particularly good sense of earing thanks to their inner ear which includes three tiny bones. Reptiles, in contrast, have a single inner ear bone. The lower jaw of reptiles is composed of multiple bones while the lower jaw of mammals is a single bone. Fossil and developmental evidence indicate that the inner ear bones of mammals evolved from lower jawbones. This suggests that the inner ear bones of mammals are 1. an analogy 2. an exaptation 3. a living fossil 4. a transitional trait 5. a vestigial structure

Briefly describe why some vertebrates can hear. Why is this an important evolutionary adaptation?

What is the function of the three ossicles shown in blue (10, 12, 13)? ear with labels colorful.png a. amplify the motion created by sound waves hitting the tympanic membrane (ear drum) and conveying that to the labyrinth's little oval window, causing fluid to slosh inside the cochlea B . move when the tympanic membrane (ear drum) moves, creating pressure waves in the middle ear that feed down into the pharynx and combine with sound wave information from our jaws C. When the tympanic membrane (ear drum) moves, their mechanoreceptors are activated to send neural impulses to the brain about the sound wave intensities (loudness) D. they equalize the pressure inside the ear to protect the delicate sensory cells inside the inner ear

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Question

Chapter 32, Problem 11PIAT

Summary Introduction

To review:

A hypothesis to explain the origin of mammalian ear bones.

Introduction:

The cynodont is the most diverse group of animals that includes mammals and their ancestors. In the Triassic cynodont, the ear bone was the part of the jawbone.

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Answer 3

Question

Chapter 32, Problem 11PIAT

Summary Introduction

To review:

A hypothesis to explain the origin of mammalian ear bones.

Introduction:

The cynodont is the most diverse group of animals that includes mammals and their ancestors. In the Triassic cynodont, the ear bone was the part of the jawbone.

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Answer 4

Question

Chapter 32, Problem 11PIAT

Summary Introduction

To review:

A hypothesis to explain the origin of mammalian ear bones.

Introduction:

The cynodont is the most diverse group of animals that includes mammals and their ancestors. In the Triassic cynodont, the ear bone was the part of the jawbone.

Expert Solution & Answer

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Answer 5

Chapter 32, Problem 11PIAT

Summary Introduction

To review:

A hypothesis to explain the origin of mammalian ear bones.

Introduction:

The cynodont is the most diverse group of animals that includes mammals and their ancestors. In the Triassic cynodont, the ear bone was the part of the jawbone.

Answer 6

Chapter 32, Problem 11PIAT

Summary Introduction

To review:

A hypothesis to explain the origin of mammalian ear bones.

Introduction:

The cynodont is the most diverse group of animals that includes mammals and their ancestors. In the Triassic cynodont, the ear bone was the part of the jawbone.

Answer 7

Chapter 32, Problem 11PIAT

Summary Introduction

To review:

A hypothesis to explain the origin of mammalian ear bones.

Introduction:

The cynodont is the most diverse group of animals that includes mammals and their ancestors. In the Triassic cynodont, the ear bone was the part of the jawbone.

Answer 8

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Answer 9

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Answer 11

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A hypothesis to explain the origin of mammalian ear bones. Introduction: The cynodont is the most diverse group of animals that includes mammals and their ancestors. In the Triassic cynodont, the ear bone was the part of the jawbone.

Solution Summary: The author explains that the ear bone in mammals evolved from the jaw bones of an early amniote (cynodont).

Concept explainers

Videos

To review:

A hypothesis to explain the origin of mammalian ear bones.

Introduction:

The cynodont is the most diverse group of animals that includes mammals and their ancestors. In the Triassic cynodont, the ear bone was the part of the jawbone.

Want to see the full answer?

Chapter 32 Solutions

A hypothesis to explain the origin of mammalian ear bones. Introduction: The cynodont is the most diverse group of animals that includes mammals and their ancestors. In the Triassic cynodont, the ear bone was the part of the jawbone.

Solution Summary: The author explains that the ear bone in mammals evolved from the jaw bones of an early amniote (cynodont).

Concept explainers

Videos

To review: A hypothesis to explain the origin of mammalian ear bones. Introduction: The cynodont is the most diverse group of animals that includes mammals and their ancestors. In the Triassic cynodont, the ear bone was the part of the jawbone.

Want to see the full answer?

Chapter 32 Solutions

To review:

A hypothesis to explain the origin of mammalian ear bones.

Introduction:

The cynodont is the most diverse group of animals that includes mammals and their ancestors. In the Triassic cynodont, the ear bone was the part of the jawbone.