The correct sequence for the perception of smell in mammals is

When mammals inhale air, the airborne molecules carrying various scents dissolve in the mucus membrane lining the nasal cavity. The dissolved chemicals bind to the olfactory receptor neurons present in the sensory cells, generating electrical impulses that travel along the olfactory nerve fibers to the olfactory bulb, which is part of the brain. From the olfactory bulb, the impulses are transmitted to various parts of the brain responsible for processing the smell. Therefore, the correct sequence for the perception of smell in mammals is "dissolved chemicals → sensory cells → olfactory nerve → brain".