狠狠撸

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