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This Concept Map, created with IHMC CmapTools, has information related to: Trilobites, water columns which caused them to be browsers, arthropods which means they have bilateral symmetry, reefs which caused them to be browsers, arthropods include millipedes, deep ocean bottoms which caused them to be predators, filter feeders who fed on zooplankton, open ocean which caused them to be predators, prey for animals such as Nautiloids, exoskeletons and don't have a vetebrate, limestone rocks that form in open ocean, arthropods which means they have segmented bodies, deep ocean bottoms which caused them to be predators, deep ocean bottoms which caused them to be browsers, sizes from about 1 mm, water columns which caused them to be browsers, prey for animals such as Anomalocaris, fossilized which required exclusion of oxygen, open ocean which caused them to be predators, trilobites lived in different zones of the ocean such as open ocean, trilobites lived in different zones of the ocean such as reefs