Final answer:
The primary olfactory organs in arthropods are located on their antennae, where they detect chemical stimuli that are vital for survival.
Step-by-step explanation:
In arthropods, the primary olfactory organs are generally located on the antennae. Unlike vertebrates, where the olfactory receptor cells are located within the nasal cavity, arthropods have their olfactory receptors on their antennae. These antennae act as the sites for odor molecules to interact with chemical receptors that are sensitive to a wide array of odors. The sensory neurons present in the antennae send signals to the arthropod's central nervous system, enabling the creature to process smells. The process of olfaction in arthropods involves the detection of chemical stimuli from the environment, which is crucial for various behaviors like finding food, mates, and avoiding predators.