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The simplest type of canal system in Porifera is:

1. ascon type
2. leucon type
3. sycon type
4. radial type

Correct answer: ascon type

Solution

Ascon type is the simplest canal system in Porifera because water enters directly into a central spongocoel lined with choanocytes. More complex forms like sycon and leucon increase surface area and filtration efficiency.

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