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underwater anemone white orange tentacles marine life ocean sea flower underwater photography macro photography nature wildlife biology zoology invertebrate cnidarian anthozoa actiniaria flower anemone white anemone orange anemone tentacle oral disc column basal disc gastrovascular cavity mesoglea epithelium endoderm ectoderm nematocyst symbiosis algae zooxanthellae chlorophyll photosynthesis respiration circulation digestion excretion reproduction regeneration growth development behavior