Q: In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
Members of this phylum possess gelatinous mesohyl regions through which food-collecting amoebocytes travel. Most are hermaphrodites, lack nerves and muscles, and were not regarded as animals until the eighteenth century. Water flows through the osculum in and out of the central cavity, called the spongocoel. FTP, identify this invertebrate phylum which includes the sponges.
A:
Science