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filter feeding method in which food particles are filtered from water as it passes by or through some part of the organism hermaphrodite an organism that has both male and female reproductive organs external fertilization the process by which the female lays eggs and the male fertilizes them once they are outside of the female internal fertilization Process in which eggs are fertilized inside the female's body porifera the phylum that contains sponges, the most simple animals intracellular digestion type of digestion used by simple invertebrates that breaks down food inside the cell budding asexual reproduction in which a part of the parent organism pinches off and forms a new organism gemmules produced when sponges are facing tough living conditions. these can survive freezing temperatures and drought