Why memory for smells is superior to visual, auditory and tactile.

Why memory for smells is superior to visual, auditory and tactile. What does this indicate and what is the biological meaning of this phenomenon?

There are several explanations for the fact that we are better at remembering smells than auditory and visual images. Smells are very important to humans, as they are to most other animals. The fact is that a person remembered the smells of animals dangerous to him in ancient times. Feeling this smell again, the person understood about the danger and could avoid it. Also, the person remembered the smells of dangerous and safe plants. Smell helps to feel the taste. Nowadays, we do not need to memorize the smells of wild animals, but we still have a good memory.