1. Movement of molecules
1.1. Direction of movement
1.1.1. Diffusion
1.1.1.1. Osmosis
1.2. Active transport
1.2.1. Endocytosis and phagocytosis
2. Gasses: Oxygen and carbon dioxide
3. Cell membrane
3.1. Internal membranes
4. Organelles
4.1. Mitochondria
4.1.1. ATP
4.1.2. Cellular respiration
4.2. Chloroplasts
4.2.1. Photosynthesis
5. Size
6. Multicellular organisms
6.1. Characteristics of absorptive surfaces
6.1.1. SA:V
6.1.2. capillary bed
6.1.3. One cell layer thick
6.1.4. moist
6.2. Differentiation and specialisation
6.2.1. Systems
6.2.1.1. Animals with blood: Capillaries
6.2.1.2. Digestive - nutrient absorption
6.2.1.2.1. Enzymes
6.2.1.2.2. Human: Villi
6.2.1.3. Circulatory - transport
6.2.1.3.1. Plants
6.2.1.4. Respiratory
6.2.1.4.1. Animals: alveoli & gills
6.2.1.4.2. Plants
6.2.1.4.3. Animals: Oxygen in / carbon dioxide out
6.2.1.5. Excretory
6.2.1.5.1. Nephron
6.2.1.5.2. Osmoregulation
6.2.1.6. Nervous
6.2.1.6.1. Thermal regulation
6.2.1.7. Hormonal
6.2.1.7.1. Enzymes
6.2.1.8. Immune
7. Prokaryotic and eukaryotic
8. Homeostasis
8.1. Stimulus/response model
8.2. Feedback control
9. Metabolism and energy
10. Requirements for survival
10.1. Matter
10.1.1. Nutrients
10.1.1.1. Synthesis of complex molecules
10.1.1.1.1. proteins
10.1.1.1.2. carbohydrates
10.1.1.1.3. lipids
10.1.1.1.4. nucleic acids
10.1.2. Water
10.1.2.1. Cohesion
10.1.2.2. Adhesion