This is a simple and adaptable set of lessons covering the topics from Lower Cambridge Secondary Science (Stage 7) Chapter 3. It can also be used “out of the box”. The learning objectives covered are: “To identify different ecosystems on Earth” “To recognise the range of habitats in an ecosystem” “To describe the effect of toxic substances in an ecosystem” “To describe the effects of new or invasive species on an ecosystem” The lessons included are: “Lesson 1 - 3.1 What are Habitats and Ecosystem” “Lesson 2 - 3.1 Investigating Habitats and Ecosystems” “Lesson 3 - 3.2 Food Chains and Energy Flow” “Lesson 4 - 3.2 Bioaccumulation and its Effects” “Lesson 5 - 3.3 Invasive Species and Competition” “Lesson 6 - 3.3 Invasive Species and their Effects” The resource is designed to be used alongside the student book and work book for questions.