What does an adult sponge have?\nOptions:\n- (A) gills\n- (B) Length\n- (C) polyps\n- (D) Energy.\n- (E) alveoli\n- (F) a cuticle\n- (G) retina\n- (H) Energy
Step-by-step reasoning process below:
(C)
Adult sponges are sessile.

Polyps can be peduncular or sessile, and are usually viral in origin.

Adult sponges have polyps.

.

Final answer: (C)