B. F. Skinner used a chamber equipped with a device that delivers food or water when an animal makes a desired response. This device is called a(n):

Assessing an individual's standing on the Big Five today has the advantage of providing a(n) ________ personality description.

Fill in the blank(s) with the appropriate word(s).

Light enters the eye through the _______

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