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a
possess canal system
b
possess water vascular system
c
are hermaphrodites or bisexual
d
reproduce by asexual means only
answer is A.
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Detailed Solution
Canal system or aquiferous system is the unique feature of Porifera.Many other organisms other than sponges are hermaphrodites in kingdom Animalia.Water vascular system is a unique feature of Echinodermata.Sponges reproduce both asexually and sexually. Some other animals like coelenterates also exhibit asexual reproduction.