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The zone that would be most difficult for a plant to live in is the  Benthic zone. It is the zone at the lowest level of a body of  water.
Quick Answer. Animal life from the topmost to the lowest oceanic zone ranges from sharks and other fish to deep-sea squid and echinoderms such as the sea pig and sea cucumber. The oceanic or pelagic zone has every form of animal life that lives away from the coastal regions.