Foods that are potentially poisonous or inedible can often be detected by the taste receptors, which are located at the very back of the tongue.

Poisonous foods can be detected by the bitter taste receptors.

Explanation:

The tongue has various taste receptors, which detect the 5 tastes:

Since most poisons are bitter, they are easily detected by these taste receptors. This taste has evolved in order to keep individuals safe from poisoning themselves and surviving.

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