Odorless chemicals that serve as a social signal to other members of one’s species are called .

The correct answer is: Pheromones.

Explanation:

Pheromones can be defined as certain chemical substances which are small and volatile in nature. They are also water soluble.Many of the pheromones are made up of peptides and proteins.They are secreted or released into the environment by animals and can get dispersed to long distances.They are used by animals for various purposes of communications like:To spread a response of alarm to the entire community of animals, in case of any danger.To attract members of the opposite sex at the time of ovulation or sexual maturity.To demarcate the territory of an animal.To inform other members of a social group about the availability of food at a particular location.

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The answer would be sand and gravel