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Biology P. meandrina is a hermaphrodite and each polyp contains four sets of male and four sets of female gonad s. The larva e develop inside the body of the polyp and are not expelled into the water until they are mature .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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