Choose the correct answers from the alternatives given.
The canal system is characteristic of:

sponges

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sea anemones

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sea urchins

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sea horses

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Solution

The correct option is A sponges
Spongocoel opens to the outside through a narrow circular opening, the osculum located at the distal free end of the sponge body. Water enters through ostia into spongocoel and goes out of the body through the osculum. This type of canal system is a characteristic of syconoid sponges.
So, the correct option is, 'sponges'.

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