What every cell needs — and how multicellular life solves the supply problem
How cells organise into the functional architecture of a multicellular body
How trees defy gravity and pull water 100 metres into the sky
How plants regulate water loss through guard cells and environmental responses
How plants move photosynthate from source to sink via the mass flow hypothesis
How root hair cells, osmosis and active transport supply the plant from soil
How CO2 and O2 move through stomata, lenticels and the leaf's internal structure
Breaking food into nutrients — the alimentary canal and accessory organs
How amylase, pepsin and lipase break macromolecules into absorbable monomers
How villi and microvilli get glucose, amino acids and fats into the bloodstream
The respiratory system, alveolar structure and the maintenance of diffusion gradients
Double circulation, cardiac structure and the cycle that pumps blood 100,000 times a day
The composition of blood and how arteries, veins and capillaries serve different functions
Fluid balance, fat absorption and immune surveillance — the body's hidden network
Xylem and phloem versus the cardiovascular system — similarities, differences and why each works
Tying together cells, tissues, organs and systems — why organisation is the secret to complex life