Male dogs use_  in urine to mark their territory.
ammonia Chemical energy proteins semiochemicals animals heat produced nitric oxide They have thick fur
A B C D E F G H
Pheromones are a sub-category of semiochemicals.
Male dogs use semiochemicals in urine to mark their territory.
Male dogs use_  in urine to mark their territory. (A) ammonia (B) Chemical energy (C) proteins (D) semiochemicals (E) animals (F) heat produced (G) nitric oxide (H) They have thick fur