One possible reason why the back of the tongue is most sensitive to bitter tasting substances is

Question

Accepted Answer

To act as a last line of detection for potentially toxic substances

Answer

Likely because we need the tips of our tongue to be more sensitive to salty and sweet substances

Answer

Bitter substances are rare whereas sweet and salty substances are much more common

Answer

To act as an early detector of unripe fruits

Answer

To act as an early detector of bitter foods

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