31. Invertebrates
Porifera and Cnideria
Multiple Choice
Multiple ChoiceWhich of the following is/are characteristic of sponges?
A
They have collar cells.
B
They consist of two layers of cells with a noncellular gelatinous layer between them.
C
They have holes, or pores, in specialized cells, through which water enters.
D
None of the listed responses is correct.
E
All of the listed responses are correct.
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