Q: What uses semiochemicals in urine to mark territory?\nOptions:\n- (A) koalas\n- (B) bacteria\n- (C) humans\n- (D) dogs\n- (E) bears\n- (F) cats\n- (G) the Sun\n- (H) rabbit
Let's think step by step below.

User
Male dogs use pheromones in urine to mark their territory. Pheromones are a sub-category of semiochemicals. Male dogs use semiochemicals in urine to mark their territory.
Thus, the answer is (D).
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