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absorbed active aminoacids ammonia Amoeba Amphibia animal beat behaviour birds blood body break-down calcium called carbohydrate carbon dioxide causes cells cent central nervous system chemical chromatophores cilia cilium coelenterates coelomic colour concentration contains contraction Crustacea digestion effect effector eggs energy enzymes excretion excretory external female fibres fish fluid formed frog gametes gills gland glucose glycogen haemoglobin hormone impulse increased insects intestine invertebrates kidney known lactic acid larvae light mammals mechanism membrane metabolism molecule molluscs mouth movement moves msec muscle nematocysts nephridium nerve nitrogen normal occurs ordinary osmotic pressure ovulation oxidation oxygen oxyhaemoglobin Paramecium particles phosphate physiology pigment pituitary probably produced protein Protozoa pseudopodia react reaction reflex respiration respiratory response secretion sense organs sensitive sexual shown similar skin species sperms stimulus substance surface synapse takes place temperature tension tion tissue tube tubules urea uric acid urine vertebrates vitamin