Justify it is not so hard but I can't do
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partly i can answer
They belomg to kingdom porifera.
Those holes help in developing a watar canal system for circulating water for food and oxygen.
They have so many holes and a large sized oitled called ostia
They belomg to kingdom porifera.
Those holes help in developing a watar canal system for circulating water for food and oxygen.
They have so many holes and a large sized oitled called ostia
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