When did the Inca civilization exist

The Inca Empire was a vast empire that flourished in the Andean region of South America from the early 15th century A.D.

Explanation:

earlier philosophers whose work influenced the enlightenment included bacon, descartes, locke, and spinoza. the major figures of the enlightenment included beccaria, diderot, hume, kant, montesquieu, rousseau, adam smith, and voltaire. it spread the ideas of the enlightenment across europe and beyond.

answer; i believe the correct answer is prefrontal cortex;