The given blank space in the statement, “the first animals to live on land were _____ because their external skeletons, also called _ supported the animals’ weight while protecting their bodies from ______.” Introduction: The first land animal evolved around 430 million years ago. These animals were the first invertebrates, which thrived on land. The main reasons for their success include a hard body covering, small size, improved motility, and the absence of competition from other species.

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Answer 1

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Chapter 18, Problem 6FTB

Summary Introduction

To review:

The given blank space in the statement, “the first animals to live on land were _____ because their external skeletons, also called _ supported the animals’ weight while protecting their bodies from ______.”

Introduction:

The first land animal evolved around 430 million years ago. These animals were the first invertebrates, which thrived on land. The main reasons for their success include a hard body covering, small size, improved motility, and the absence of competition from other species.

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Answer 2

Question

Chapter 18, Problem 6FTB

Summary Introduction

To review:

The given blank space in the statement, “the first animals to live on land were _____ because their external skeletons, also called _ supported the animals’ weight while protecting their bodies from ______.”

Introduction:

The first land animal evolved around 430 million years ago. These animals were the first invertebrates, which thrived on land. The main reasons for their success include a hard body covering, small size, improved motility, and the absence of competition from other species.

Expert Solution & Answer

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Answer 3

Question

Chapter 18, Problem 6FTB

Summary Introduction

To review:

The given blank space in the statement, “the first animals to live on land were _____ because their external skeletons, also called _ supported the animals’ weight while protecting their bodies from ______.”

Introduction:

The first land animal evolved around 430 million years ago. These animals were the first invertebrates, which thrived on land. The main reasons for their success include a hard body covering, small size, improved motility, and the absence of competition from other species.

Expert Solution & Answer

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Answer 4

Question

Chapter 18, Problem 6FTB

Summary Introduction

To review:

The given blank space in the statement, “the first animals to live on land were _____ because their external skeletons, also called _ supported the animals’ weight while protecting their bodies from ______.”

Introduction:

The first land animal evolved around 430 million years ago. These animals were the first invertebrates, which thrived on land. The main reasons for their success include a hard body covering, small size, improved motility, and the absence of competition from other species.

Expert Solution & Answer

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Answer 5

Chapter 18, Problem 6FTB

Summary Introduction

To review:

The given blank space in the statement, “the first animals to live on land were _____ because their external skeletons, also called _ supported the animals’ weight while protecting their bodies from ______.”

Introduction:

The first land animal evolved around 430 million years ago. These animals were the first invertebrates, which thrived on land. The main reasons for their success include a hard body covering, small size, improved motility, and the absence of competition from other species.

Answer 6

Chapter 18, Problem 6FTB

Summary Introduction

To review:

The given blank space in the statement, “the first animals to live on land were _____ because their external skeletons, also called _ supported the animals’ weight while protecting their bodies from ______.”

Introduction:

The first land animal evolved around 430 million years ago. These animals were the first invertebrates, which thrived on land. The main reasons for their success include a hard body covering, small size, improved motility, and the absence of competition from other species.

Answer 7

Chapter 18, Problem 6FTB

Summary Introduction

To review:

The given blank space in the statement, “the first animals to live on land were _____ because their external skeletons, also called _ supported the animals’ weight while protecting their bodies from ______.”

Introduction:

The first land animal evolved around 430 million years ago. These animals were the first invertebrates, which thrived on land. The main reasons for their success include a hard body covering, small size, improved motility, and the absence of competition from other species.

Answer 8

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Answer 9

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Answer 11

Ch. 18 - 1. Almost all of the oxygen gas in today’s...Ch. 18 - Extinction a. generally does not occur except...Ch. 18 - 3. In the endosymbiotic origin of the...Ch. 18 - 4. Which of the following does not list...Ch. 18 - Prob. 5MC Ch. 18 - 1. Because there was no oxygen in the earliest...Ch. 18 - 2. The molecule ________ became a candidate for...Ch. 18 - 3. Complex cells that contain a nucleus and other...Ch. 18 - 4. The sperm of early land plants had to reach the...Ch. 18 - 5. Early plants that protected their seeds within...

Solution Summary: The author explains that the first animals to live on land were arthropods because their external skeleton supported their weight while protecting their bodies from drying.

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