Answers

2016-03-14T11:17:56+05:30
Execretory  organs for porifera is ostia and for  execretory organ for cockroach is malphigian tubules
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2016-03-14T11:27:34+05:30

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Excretory organs for poriferans is ostium and for cockroach is malpighain tubules.
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