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(a) (1) Bryophyta
(2) Platyhelminthes
(b) with a using of pores .....
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Explanation:
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(a)..
(i) Bryophytes as they require water for fertilization
(ii) platyhelminthes as they have dorsoventrally flattened body
(b) food and oxygen enter the body of porifera through ostia into the body cavity(spongeocoel) where there occurs exchange of gases absorption of food and other materials and exchange of wastes and then the wastes and gases like CO2 are excited through the osticulum out of the body of porifera
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