Answer:
3, 1, 4, 2
Explanation:
The olfactory system is one of the oldest systems in the organism which allows the organism to smell the surrounding environment.
The organism senses the surrounding environment by the olfactory tissues. In humans, the olfactory tissue is present in the nasal cavity. The olfactory indicator is perceived by the olfactory epithelium.
When the olfactory stimulus covers the epithelium, the GPCR transduction begins which sends the signals to the olfactory bulb. From the olfactory bulb, the signals are transmitted via the olfactory tract to the olfactory cortex in the temporal lobe of the brain.
Thus, 3, 1, 4, 2 are correct.
