Which of the following statements is true about sponges?

1.	Which of the following statements is true about sponges?
A.	They have the water vascular system.
B.	They have numerous pores on their body.
C.	They have a cavity in the body.
D.	Their body is made up of two layers.
Answer» C. They have a cavity in the body.

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Which of the following statements is true about sponges?

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