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oyster shell mollusc seafood food raw animal ocean marine life nature photography still life macro close up detail texture pattern shape form color light shadow reflection refraction translucency opacity transparency iridescence pearlescent nacre mother-of-pearl abalone scallop clam mussel bivalve invertebrate aquatic habitat environment ecosystem food chain trophic level predator prey symbiosis parasitism commensalism mutualism competition adaptation evolution natural selection survival of the fittest extinction endangered species conservation protection preservation oyster reef habitat restoration environmental protection sustainable development oceanography marine biology zoology invertebrates bivalves oysters