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moray eel fish underwater ocean marine life nature wildlife biology animal predator fangs teeth scales slimy wet gills nostrils eyes head body tail fin dorsal pectoral pelvic anal caudal vertebrae skeleton muscle flesh blood nervous system digestive system respiratory system circulatory system excretory system reproductive system sense organs communication behavior habitat distribution population conservation threats fishing hunting pollution climate change global warming ocean acidification coral bleaching disease parasites predators prey symbiosis mutualism commensalism parasitism competition adaptation evolution taxonomy classification morphology physiology ecology behavior conservation