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fish two heads strange animal nature sea food weird ugly mutant monster abnormal evolution mutation nature biology science evolution darwin species adaptation environment survival extinction evolutionary biology genetics natural selection speciation extinction biodiversity conservation fisheries overfishing pollution climate change habitat loss invasive species disease parasite predator prey food chain food web trophic level energy flow biomass production consumption respiration excretion growth reproduction life cycle death decomposition nutrient cycling ecosystem community population organism individual species genus family order class phylum kingdom domain