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Book 2C Unit 20


 

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Suggested Teaching Scheme (S4 to S6)
Suggested Teaching Scheme (S3 to S6)
Combined Science Suggested Teaching Scheme (S4 to S6)

 

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20.1 Introduction to ecology
20.2 Components of an ecosystem
20.3 Energy flow in an ecosystem
20.4 The carbon cycle
20.5 The nitrogen cycle
20.6 A summary: the roles of organisms in energy flow and material cycling
20.7 Conservation of ecosystems
20.8 Ecological study

 

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Chapter 20

 

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Chapter 20

 

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Introduction: What is the nature of science?

 

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Introduction

 

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