The single brain structure most associated with learning is ______.

A recent discovery about the long-lived residents of isolated areas in the Republic of Georgia, Pakistan, and Ecuador shows that they

have no children. have different genetic clocks. may be lying about their age. have no maximum life span.

The _______________ protects the eye and bends incoming light rays toward a lens located behind it

a. pupil b. iris c. cornea d. retina