What can live in salt water?\nOptions:\n- (A) otters\n- (B) spider\n- (C) amoeba\n- (D) clam\n- (E) alligator\n- (F) ducks\n- (G) goldfish\n- (H) voles Let's solve this problem gradually.

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Mollusks live in most terrestrial, freshwater, and marine habitats. Mollusks tend to be shore-dwelling creatures. Clams tend to be shore-dwelling creatures and can live in both sea and freshwater. So the final answer is (D).
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