Answer
a. chemical communication
Work Step by Step
Pheromones consist of many combinations of chemicals that are produced in gland found on the face, head, chest, arms, legs, back, rump, between the toes, or in several such locations. Some also are situated so they can add chemicals to body wastes. Each odor has a specific message and may travel as liquid, vapor, or gas in water or air or on the ground. Both taste and smell are used to interpret these chemical messages. Pheromones carry information about such things as identity, territory, sex, food, assembly, and danger.
