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

Only mammals possess 3 ossicles in the ear? TRUE OR FALSE?

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

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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.

Expert Solution & Answer

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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 11

Ch. 32 - 2. What trait(s) define(s) the vertebrates? a....Ch. 32 - Most species of hominins are known only from...Ch. 32 - 7. There is some evidence that pharyngeal slits...Ch. 32 - 9. Consider the evolution of protostomes (Chapter...Ch. 32 - Prob. 11PIAT Ch. 32 - Evolution often results in the co-option of a...

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

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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.