_____ are chemical signals that, instead of being secreted into the bloodstream, are introduced by animals into their habitats. They can be used to attract mates and mark territories.

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Pheromones are chemical signals that animals secrete into their habitats to communicate with other animals of the same species. They can be used to attract mates, mark territories, or signal alarm or aggressiveness. Unlike hormones, which are secreted into the bloodstream to act on distant target organs, pheromones act locally, affecting nearby individuals' behavior and physiology.

_____ Are Chemical Signals That, Instead of Being Secreted into the Bloodstream