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underwater close up orange white sea anemone marine life tentacles underwater photography ocean nature wildlife biology zoology invertebrate cnidarian anthozoa actiniaria gills oral disc column basal disc mesoglea endoderm ectoderm gastrovascular cavity radial symmetry bilateral symmetry asexual reproduction sexual reproduction regeneration symbiosis mutualism commensalism parasitism predation prey predator food chain food web trophic level biodiversity conservation ecosystem habitat niche population