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Option 1: Hormones are chemical substances produced by glands in the body that regulate various bodily functions. While hormones may play a role in attracting members of the same species, they are not specific to this purpose.
Option 2: Nucleic acids, such as DNA and RNA, are involved in genetic information transfer and protein synthesis. They are not directly involved in attracting members of the same species.
Option 3: Pheromones are the correct answer. Pheromones are chemicals released by an animal to communicate with others of the same species. They play a vital role in attracting mates, marking territories, and coordinating social behaviors.
Option 4: Steroids are a class of hormones that regulate various physiological processes. While some steroids may play a role in attracting mates, not all chemicals released for this purpose are steroids.
Therefore, the correct answer is option 3: pheromones.