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Digestion and Excretion

What do you think?

LESSON

LESSON INTRODUCTION

Get Ready

Before you begin, decide if you agree or disagree with each of these statements.

As you view this presentation, see if you change your mind about any of the statements.

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  • The shape of an animal’s teeth depends on its diet.
  • Excretion is used only by animals that live on land.

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Digestion and Excretion

Do you agree or disagree?

Get Ready

LESSON

LESSON INTRODUCTION

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Digestion and Excretion

  • How are an animal’s structures for feeding and digestion related to its diet?
  • How do the excretory structures of aquatic and terrestrial animals differ?

Key Concepts/Essential Questions

LESSON

LESSON INTRODUCTION

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  • crop
  • gizzard
  • absorption

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Digestion and Excretion

Vocabulary

Watch out for these words!

LESSON

LESSON INTRODUCTION

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Digestion and Excretion

What is it doing?

Look at the photo at the beginning of the lesson. This caterpillar is chewing food—one step in the processes of digestion and excretion. Animals perform these processes to get the energy they need to live.

LESSON

LESSON INTRODUCTION

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Digestion and Excretion

LESSON

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The shape of an animal’s teeth depends on its diet.

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Digestion and Excretion

Agree. Animals with different diets have differently shaped teeth for consuming that diet.

Do you agree or disagree?

Lesson Review

LESSON

LESSON WRAP-UP

Do you agree or disagree?

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Excretion is used only by animals that live on land.

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Digestion and Excretion

Disagree. Aquatic animals excrete water, ammonia, and carbon dioxide using kidneys and gills.

Do you agree or disagree?

Lesson Review

LESSON

LESSON WRAP-UP

Do you agree or disagree?

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How are an animal’s structures for feeding and digestion related to its diet?

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Digestion and Excretion

An animal’s feeding structures depend on its diet. Animals that eat meat have sharp teeth that cut and tear, and animals that eat plants have wide, flat teeth for grinding.

Key Concept/Essential Question Review

LESSON

LESSON WRAP-UP

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How do the excretory structures of aquatic and terrestrial animals differ?

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Digestion and Excretion

Aquatic animals use kidneys to excrete large amounts of water and ammonia. Terrestrial animals use kidneys to excrete smaller amounts of water and either urea or uric acid. Aquatic animals excrete carbon dioxide through gills, and terrestrial animals excrete carbon dioxide through the lungs or spiracles.

Key Concept/Essential Question Review

LESSON

LESSON WRAP-UP