In the stomach, food particles are mixed with

a. water and enzymes

Who is most likely suffering from retrograde amnesia?

A) Billy, who can't seem to learn a foreign language. B) Margie, who can't remember much of anything prior to being attacked on the street after a late-night party. C) Cecil, who cannot remember long telephone numbers without writing them down right away. D) Mariana, who struggles to remember the names of the people she just met.

According to the opponent-process theory of color vision, the correct pairings of opposite colors are

a. red versus green and blue versus yellow. b. black versus gray and white versus colored. c. blue versus red and green versus yellow. d. blue versus green and red versus yellow. e. grey versus black and green versus blue.