The deepest ocean zone, found in trenches and canyons, is called the hadal zone. find it on the illustration. the few species that live here include tiny isopods, a type of crustacean related to crabs and shrimp and invertebrates such as sponges and sea cucumbers. considering the darkness, depth, cold temperatures, how do these organisms get the food needed to survive? a) they swim to higher layers to find prey for food. b) they undergo chemosynthesis and make their own food. c) they are bioluminescent organisms and they undergo photosynthesis to produce the food they need. d) they are dependent on falling parts of dead or decaying plants and animals, called marine detritus.