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This page contains revision pages for a number of topics in the Cambridge IGCSE Science (Combined) course - 0653
BIOLOGY - a work in progress - adding content in 2025-2026
B1 Characteristics of living organisms: B1.1 Characteristics of living organisms
B2 Cells: B2.1 Cell structure
B2 Cells: B2.2 Size of specimens
B3 Movement in and out of cells: B3.1 Diffusion B3.2 Osmosis B3.3 Active transport
B4 Biological Molecules: B4.1 Biological molecules
B5 Enzymes: B5.1-5.6 Enzymes
B7 Human nutrition: B7.1 Diet, B7.2 Digestive system & B7.3 Digestion
B14 Reproduction: B14.1 Reproduction in Plants
B15 Organisms and their environment: B15.1 Energy Flow
B15 Organisms and their environment: B15.2 Food Chains and Webs
B15 Organisms and their environment: B15.3 The Carbon Cycle
B16 Human Influences on ecosystems: B16.1 Habitat Destruction
B16 Human Influences on ecosystems: B16.2 Conservation
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