Our "oldest" sense,which works in a very similar way in insects,is the sense of:

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The sense of smell is the oldest sense, as it is present in both insects and humans from very early stages of evolution. The olfactory receptors in insects are particularly sensitive and specialized, allowing them to detect and respond to a wide range of odors. This sense is essential for locating food, avoiding predators, and finding mates in many insect species.

Our "Oldest" Sense,which Works in a Very Similar Way in Insects,is