Which of the following cells line the spongocoels and canals in members of the phylum Porifera?

Explanation

Collar cells, or choanocytes, line the spongocoel in simple asconoid sponges and the flagellated canals or chambers of other sponge architectures. Their flagella drive water flow and their collars help capture food; not every canal or every spongocoel surface is lined by choanocytes.