Biology
Relationships in an ecosystem Living Organisms Movement across cell membranes Nutrition, digestion and excretion PlantsEcosystems and habitats
Living Organisms
Nutrition, digestion and excretion
Gas Exchange and Respiration
Respiratory System
Gas Exchange in Plants
Gas exchange experiments
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Health and disease Inheritance and genetics Humans and the environment Blood Red blood cells Health and disease
Inheritance and genetics
Humans and the environment
Transport
The circulatory system
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Nerves and hormones
The nervous system
Nervous system
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Life Processes and Cells