Keywords: the kidney, nephron, hormones, water content.

Keywords: animal cells, microscopy.

Keywords: microscopy, stomata.

Keywords: pyramid of biomass, food chain, energy transfer.

Keywords: blood flow, the heart, heart rate.

Keywords: body temperature, thermoregulation, vasodilation.

Keywords: nitrates, nitrate fertilisers, nitrogen-fixing bacteria.

Keywords: photosynthesis, light intensity, temperature, transpiration, translocation.

Keywords: hormones, oestrogen, progesterone, menstrual cycle, adrenalin.

Keywords: plant shoots, plant hormones, plant adaptations.