"What characteristic is responsible for the branching off of the flatworms from earlier animals?<br /> What characteristic first shows up in this phylum?", "ascoelomates<br /> bilateral symmetry" "What level of organization do these organisms demonstrate?", "organ system level" "How many tissue layers do these organisms have?", "triploblastic -->epidermis, mesodermis, endodermis" "What type of digestive system is seen in these animals?", "gastrovascular cavity" "When did they show up in the evolutionary history?", "unknown" "Where are they found?", "worldwide" "Type of Body Cavity", "Acoelomate" "Type of nervous system", "Pair of anterior ganglia with longitudinal nerve cords" "Type of Excretory system", "Protonephridia (flame cells)" "Type of Asexual reproduction", "Regeneration"
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