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bio biology lesson reproduction ecology plants human heredity cell division humans molecular genetics eye lesson 1 biologypro transport water nutrients deforestation overfishing pollution mitosis system homeostasis example excretion kidney action function enzymes absorption digestion nutrition plant structure meiosis nervous reflex pupil focusing accommodation regulation temperature equilibrium constant changes fertilisation fertilization conservation air numbers biomass pyramid energy factor biotic factors abiotic structrue dna translation gene transcription genetic engineering biologyn incomplete multiple complete sex determination alleles dominance mutations mutation variation discontinuous continuous pea mendel division cell cell cycle lesosn 4 family planning std sex pregnancy fertilization fertilisation menstrual cycle light pupil reflex hormones adrenaline pollination types gland glands insulin endocrine anatomy nervous system introduction capacity lungs lung exchange gaseous respiration anaerobic aerobic xylem phloem o level mr tan spectrum mineral salts biology photosynthesis experiments blood capillary artery blood vessels vein chamber heart valve properties characteristics enzyme alimentary canal assimiliation leaves leaf carbohydrates proteins fats fibre vitamins balanced diet comparison active transport hypotonic solutions hypertonic isotonic diffusion osmosis specialised cells animal cell plant cell