zone urbaine (1) système immunitaire (1) histoire (1) analyse (1) danger (1) eau douce (1) écologie (1) densité (1) Ecology (1) Density (1) Treatment (1) History (1) Area (1) Lymnaea stagnalis (1) Area (1) Phenol oxidase (1) Immune system (1) Sewage (1) Science (1) Phagocytosis (1) Life (1) History (1) Gastropoda (1) Fresh water (1) Factory and trade waste (1) Ecology (1) Density (1) Days (1) Organisms (1) Analysis (1)